Factors which indicate lower life expectancy also induce switching to a faster life strategy, that is, a higher investment in current reproduction at the expense of future reproduction and body maintenance. We tested a hypothesis according to which impairment of individual health serves as a signal for switching to a faster life strategy using online-gathered data from 32,911 subjects. Worse health was associated with lower age at menarche and earlier initiation of sexual life in women and higher sexual desire and earlier reproduction in both sexes. Individuals with worse health also exhibited lower sexual activity, lower number of sexual partners, and lower total number of children. These results suggest that impaired health shifts individuals towards a faster life strategy but also has a negative (physiological) effect on behaviours related to sexual life. Signs of a faster life strategy were also found in Rh-negative men in good health, indicating that even just genetic predisposition to worse health could serve as a signal for switching to a faster life strategy. We suggest that improved public health in developed countries and the resulting shift to a slower life strategy could be the ultimate cause of the phenomenon of demographic transition.

Department of Applied Neurosciences and Brain Imagination National Institute of Mental Health Topolova 748 Klecany Czech Republic

Department of Philosophy and History of Science Faculty of Science Charles University Vinicna 7 128 00 Prague Czech Republic

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Ellis BJ, Figueredo AJ, Brumbach BH, Schlomer GL. Fundamental dimensions of environmental risk—The impact of harsh versus unpredictable environments on the evolution and development of life history strategies. Hum. Nat. 2009;20:204–268. doi: 10.1007/s12110-009-9063-7. PubMed DOI

Reznick DA, Bryga H, Endler JA. Experimentally induced life-history evolution in a natural population. Nature. 1990;346:357–359. doi: 10.1038/346357a0. DOI

Pianka ER. On r- and K-selection. Am. Nat. 1970;104:592–597. doi: 10.1086/282697. DOI

Stearns SC. Life-history tactics: A review of the ideas. Q. Rev. Biol. 1976;51:3–47. doi: 10.1086/409052. PubMed DOI

Flegr J. Two distinct types of natural selection in turbidostat-like and chemostat-like ecosystems. J. Theor. Biol. 1997;188:121–126. doi: 10.1006/jtbi.1997.0458. DOI

Bowyer, R. T., Person, D. K. & Pierce, B. M. Detecting top-down versus bottom-up regulation of ungulates by large carnivores: Implications for conservation of biodiversity. In Large Carnivores and the Conservation of Biodiversity (eds. Ray, J. C et al.) 342–361 (Island Press, 2005).

Jones ME, et al. Life-history change in disease-ravaged Tasmanian devil populations. Proc. Natl. Acad. Sci. USA. 2008;105:10023–10027. doi: 10.1073/pnas.0711236105. PubMed DOI PMC

Scheele BC, et al. Disease-associated change in an amphibian life-history trait. Oecologia. 2017;184:825–833. doi: 10.1007/s00442-017-3911-7. PubMed DOI

Thornhill JA, Jones JT, Kusel JR. Increased oviposition and growth in immature Biomphalaria glabrata after exposure to Schistosoma mansoni. Parasitology. 1986;93:443–450. doi: 10.1017/S0031182000081166. PubMed DOI

Polak M, Starmer WT. Parasite-induced risk of mortality elevates reproductive effort in male Drosophila. Proc. R. Soc. B. 1998;265:2197–2201. doi: 10.1098/rspb.1998.0559. PubMed DOI PMC

Chadwick W, Little TJ. A parasite-mediated life-history shift in Daphnia magna. Proc. R. Soc. B. 2005;272:505–509. doi: 10.1098/rspb.2004.2959. PubMed DOI PMC

Schwanz LE. Chronic parasitic infection alters reproductive output in deer mice. Behav. Ecol. Sociobiol. 2008;62:1351–1358. doi: 10.1007/s00265-008-0563-y. DOI

Promislow DEL, Harvey PH. Living fast and dying young: A comparative analysis of life-history variation among mammals. J. Zool. 1990;220:417–437. doi: 10.1111/j.1469-7998.1990.tb04316.x. DOI

Hill K. Life history theory and evolutionary anthropology. Evol. Anthropol. 1993;2:78–88. doi: 10.1002/evan.1360020303. DOI

Charlesworth B. Evolution in Age-Structured Populations. 2. Cambridge University Press; 1994.

Nettle D, Frankenhuis WE. Life-history theory in psychology and evolutionary biology: One research programme or two? Philos. Trans. R. Soc. B. 2020;375:9. doi: 10.1098/rstb.2019.0490. PubMed DOI PMC

Del Giudice M. Rethinking the fast-slow continuum of individual differences. Evol. Hum. Behav. 2020;41:536–549. doi: 10.1016/j.evolhumbehav.2020.05.004. DOI

Lammers C, Ireland M, Resnick M, Blum R. Influences on adolescents' decision to postpone onset of sexual intercourse: A survival analysis of virginity among youths aged 13 to 18 years. J. Adolesc. Health. 2000;26:42–48. doi: 10.1016/s1054-139x(99)00041-5. PubMed DOI

Wilson M, Daly M. Life expectancy, economic inequality, homicide, and reproductive timing in Chicago neighbourhoods. BMJ. 1997;314:1271–1274. doi: 10.1136/bmj.314.7089.1271. PubMed DOI PMC

Bereczkei T, Csanaky A. Stressful family environment, mortality, and child socialisation: Life-history strategies among adolescents and adults from unfavourable social circumstances. Int. J. Behav. Dev. 2001;25:501–508. doi: 10.1080/01650250042000573. DOI

Nettle D. Dying young and living fast: Variation in life history across English neighborhoods. Behav. Ecol. 2010;21:387–395. doi: 10.1093/beheco/arp202. DOI

Griskevicius V, Delton AW, Robertson TE, Tybur JM. Environmental contingency in life history strategies: The influence of mortality and socioeconomic status on reproductive timing. J. Pers. Soc. Psychol. 2011;100:241–254. doi: 10.1037/a0021082. PubMed DOI PMC

Sheppard P, Pearce MS, Sear R. How does childhood socioeconomic hardship affect reproductive strategy? Pathways of development. Am. J. Hum. Biol. 2016;28:356–363. doi: 10.1002/ajhb.22793. PubMed DOI PMC

Belsky J, Steinberg L, Draper P. Childhood experience, interpersonal development, and reproductive strategy: An evolutionary theory of socialization. Child Dev. 1991;62:647–670. doi: 10.1111/j.1467-8624.1991.tb01558.x. PubMed DOI

Rickard IJ, Frankenhuis WE, Nettle D. Why are childhood family factors associated with timing of maturation? A role for internal prediction. Perspect. Psychol. Sci. 2014;9:3–15. doi: 10.1177/1745691613513467. PubMed DOI

Chua KJ, Lukaszewski AW, Grant DM, Sng O. Human life history strategies: Calibrated to external or internal cues? Evol. Psychol. 2017;15:1474704916677342. doi: 10.1177/1474704916677342. PubMed DOI PMC

Adamo SA. Evidence for adaptive changes in egg laying in crickets exposed to bacteria and parasites. Anim. Behav. 1999;57:117–124. doi: 10.1006/anbe.1998.0999. PubMed DOI

Giehr J, Grasse AV, Cremer S, Heinze J, Schrempf A. Ant queens increase their reproductive efforts after pathogen infection. R. Soc. Open Sci. 2017;4:170547. doi: 10.1098/rsos.170547. PubMed DOI PMC

Sorci G, Clobert J, Michalakis Y. Cost of reproduction and cost of parasitism in the common lizard, Lacerta vivipara. Oikos. 1996;76:121–130. doi: 10.2307/3545754. DOI

Oppliger A, Christe P, Richner H. Clutch size and malarial parasites in female great tits. Behav. Ecol. 1997;8:148–152. doi: 10.1093/beheco/8.2.148. DOI

Sanz JJ, Arriero E, Moreno J, Merino S. Interactions between hemoparasite status and female age in the primary reproductive output of pied flycatchers. Oecologia. 2001;126:339–344. doi: 10.1007/s004420000530. PubMed DOI

Westendorp RGJ, Kirkwood TBL. Human longevity at the cost of reproductive success. Nature. 1998;396:743–746. doi: 10.1038/25519. PubMed DOI

Thomas F, Teriokhin AT, Renaud F, De Meeus T, Guégan JF. Human longevity at the cost of reproductive success: Evidence from global data. J. Evol. Biol. 2000;13:409–414. doi: 10.1046/j.1420-9101.2000.00190.x. DOI

Figueredo AJ, Vasquez G, Brumbach BH, Schneider SMR. The heritability of life history strategy: The K-factor, covitality, and personality. Soc. Biol. 2004;51:121–143. PubMed

Figueredo AJ, Vasquez G, Brumbach BH, Schneider SMR. The K-factor, covitality, and personality—A psychometric test of life history theory. Hum. Nat. 2007;18:47–73. doi: 10.1007/bf02820846. PubMed DOI

Hill SE, Boehm GW, Prokosch ML. Vulnerability to disease as a predictor of faster life history strategies. Adapt. Hum. Behav. Physiol. 2016;2:116–133. doi: 10.1007/s40750-015-0040-6. DOI

Uggla C, Mace R. Local ecology influences reproductive timing in Northern Ireland independently of individual wealth. Behav. Ecol. 2016;27:158–165. doi: 10.1093/beheco/arv133. DOI

Waynforth D. Life-history theory, chronic childhood illness and the timing of first reproduction in a British birth cohort. Proc. R. Soc. B. 2012;279:2998–3002. doi: 10.1098/rspb.2012.0220. PubMed DOI PMC

Mace R. Evolutionary ecology of human life history. Anim. Behav. 2000;59:1–10. doi: 10.1006/anbe.1999.1287. PubMed DOI

Low BS, Simon CP, Anderson KG. An evolutionary ecological perspective on demographic transitions: Modeling multiple currencies. Am. J. Hum. Biol. 2002;14:149–167. doi: 10.1002/ajhb.10043. PubMed DOI

Galor O. The demographic transition: Causes and consequences. Cliometrica. 2012;6:1–28. doi: 10.1007/s11698-011-0062-7. PubMed DOI PMC

Protsiv M, Ley C, Lankester J, Hastie T, Parsonnet J. Decreasing human body temperature in the United States since the industrial revolution. Elife. 2020;9:e49555. doi: 10.7554/eLife.49555. PubMed DOI PMC

Novotná M, et al. Toxoplasma and reaction time: Role of toxoplasmosis in the origin, preservation and geographical distribution of Rh blood group polymorphism. Parasitology. 2008;135:1253–1261. doi: 10.1017/s003118200800485x. PubMed DOI

Flegr J, Novotná M, Lindová J, Havlíček J. Neurophysiological effect of the Rh factor. Protective role of the RhD molecule against Toxoplasma-induced impairment of reaction times in women. Neuroendocrinol. Lett. 2008;29:475–481. PubMed

Flegr J, Preiss M, Klose J. Toxoplasmosis-associated difference in intelligence and personality in men depends on their Rhesus blood group but not ABO blood group. PLoS One. 2013;8:e61272. doi: 10.1371/journal.pone.0061272. PubMed DOI PMC

Flegr J, Šebánková B, Příplatová L, Chvátalová V, Kaňková Š. Lower performance of Toxoplasma-infected, Rh-negative subjects in the weight holding and hand-grip tests. PLoS One. 2018;13:e0200346. doi: 10.1371/journal.pone.0200346. PubMed DOI PMC

Flegr J, Klose J, Novotná M, Berenreitterová M, Havlíček J. Increased incidence of traffic accidents in Toxoplasma-infected military drivers and protective effect RhD molecule revealed by a large-scale prospective cohort study. BMC Infect. Dis. 2009 doi: 10.1186/1471-2334-9-72. PubMed DOI PMC

Flegr J, Geryk J, Volný J, Klose J, Černochová D. Rhesus factor modulation of effects of smoking and age on psychomotor performance, intelligence, personality profile, and health in Czech soldiers. PLoS One. 2012;7:e4947810. doi: 10.1371/journal.pone.0049478. PubMed DOI PMC

Flegr J, Hoffmann R, Dammann M. Worse health status and higher incidence of health disorders in Rhesus negative subjects. PLoS One. 2015;10:e0141362. doi: 10.1371/journal.pone.0141362. PubMed DOI PMC

Flegr J. Heterozygote advantage probably maintains Rhesus factor blood group polymorphism: Ecological regression study. PLoS One. 2016;11:e0147955. doi: 10.1371/journal.pone.0147955. PubMed DOI PMC

Flegr J, Kuba R, Kopecký R. Rhesus-minus phenotype as a predictor of sexual desire and behavior, wellbeing, mental health, and fecundity. PLoS One. 2020;15:e0236134. doi: 10.1371/journal.pone.0236134. PubMed DOI PMC

Kaňková Š, Flegr J, Toman J, Calda P. Maternal RhD heterozygous genotype is associated with male biased secondary sex ratio. Early Hum. Dev. 2020;140:104864. doi: 10.1016/j.earlhumdev.2019.104864. PubMed DOI

Flegr J, Dama M. Does the prevalence of latent toxoplasmosis and frequency of Rhesus-negative subjects correlate with the nationwide rate of traffic accidents? Folia Parasitol. 2014;61:485–494. doi: 10.14411/fp.2014.061. PubMed DOI

Halmin M, et al. Length of storage of red blood cells and patient survival after blood transfusion: A binational cohort study. Ann. Intern. Med. 2017;166:248–256. doi: 10.7326/m16-1415. PubMed DOI

Jacobsen BK, Oda K, Knutsen SF, Fraser GE. Age at menarche, total mortality and mortality from ischaemic heart disease and stroke: The Adventist Health Study, 1976–88. Int. J. Epidemiol. 2009;38:245–252. doi: 10.1093/ije/dyn251. PubMed DOI PMC

Lakshman R, et al. Early age at menarche associated with cardiovascular disease and mortality. J. Clin. Endocrinol. Metab. 2009;94:4953–4960. doi: 10.1210/jc.2009-1789. PubMed DOI

Canoy D, et al. Age at menarche and risks of coronary heart and other vascular diseases in a large UK cohort. Circulation. 2015;131:237–244. doi: 10.1161/circulationaha.114.010070. PubMed DOI

Macsali F, et al. Early age at menarche, lung function, and adult asthma. Am. J. Respir. Crit. Care Med. 2011;183:8–14. doi: 10.1164/rccm.200912-1886OC. PubMed DOI

Stöckl D, et al. Age at menarche is associated with prediabetes and diabetes in women (aged 32–81 years) from the general population: The KORA F4 Study. Diabetologia. 2012;55:681–688. doi: 10.1007/s00125-011-2410-3. PubMed DOI

Brinton LA, Schairer C, Hoover RN, Fraumeni JF. Menstrual factors and risk of breast cancer. Cancer Investig. 1988;6:245–254. doi: 10.3109/07357908809080645. PubMed DOI

Kvale G, Heuch I. Menstrual factors and breast cancer risk. Cancer. 1988;62:1625–1631. doi: 10.1002/1097-0142(19881015)62:8<1625::aid-cncr2820620828>3.0.co;2-k. PubMed DOI

Adair LS. Size at birth predicts age at menarche. Pediatrics. 2001;107:e59. doi: 10.1542/peds.107.4.e59. PubMed DOI

Romundstad PR, et al. Birth size in relation to age at menarche and adolescent body size: Implications for breast cancer risk. Int. J. Cancer. 2003;105:400–403. doi: 10.1002/ijc.11103. PubMed DOI

Sloboda DM, Hart R, Doherty DA, Pennell CE, Hickey M. Age at menarche: Influences of prenatal and postnatal growth. J. Clin. Endocrinol. Metab. 2007;92:46–50. doi: 10.1210/jc.2006-1378. PubMed DOI

Rich-Edwards JW, et al. Birth weight and risk of cardiovascular disease in a cohort of women followed up since 1976. BMJ. 1997;315:396–400. doi: 10.1136/bmj.315.7105.396. PubMed DOI PMC

Andersen AMN, Osler M. Birth dimensions, parental mortality, and mortality in early adult age: A cohort study of Danish men born in 1953. Int. J. Epidemiol. 2004;33:92–99. doi: 10.1093/ije/dyg195. PubMed DOI

Gluckman PD, Hanson MA. Evolution, development and timing of puberty. Trends Endocrinol. Metab. 2006;17:7–12. doi: 10.1016/j.tem.2005.11.006. PubMed DOI

Kulin HE, Bwibo N, Mutie D, Santner SJ. The effect of chronic childhood malnutrition on pubertal growth and development. Am. J. Clin. Nutr. 1982;36:527–536. doi: 10.1093/ajcn/36.3.527. PubMed DOI

Khan AD, Schroeder DG, Martorell R, Haas JD, Rivera J. Early childhood determinants of age at menarche in rural Guatemala. Am. J. Hum. Biol. 1996;8:717–723. doi: 10.1002/(sici)1520-6300(1996)8:6<717::aid-ajhb3>3.0.co;2-q. PubMed DOI

Leenstra T, et al. Prevalence and severity of malnutrition and age at menarche; cross-sectional studies in adolescent schoolgirls in western Kenya. Eur. J. Clin. Nutr. 2005;59:41–48. doi: 10.1038/sj.ejcn.1602031. PubMed DOI

Walker R, et al. Growth rates and life histories in twenty-two small-scale societies. Am. J. Hum. Biol. 2006;18:295–311. doi: 10.1002/ajhb.20510. PubMed DOI

Idler EL, Kasl SV. Self-ratings of health: Do they also predict change in functional ability. J. Gerontol. B. 1995;50:S344–S353. doi: 10.1093/geronb/50B.6.S344. PubMed DOI

O'Sullivan LF, Byers ES. College students’ incorporation of initiator and restrictor roles in sexual dating interactions. J. Sex Res. 1992;29:435–446. doi: 10.1080/00224499209551658. DOI

Smith CA. Factors associated with early sexual activity among urban adolescents. Soc. Work. 1997;42:334–346. doi: 10.1093/sw/42.4.334. PubMed DOI

Mercer CH, et al. Changes in sexual attitudes and lifestyles in Britain through the life course and over time: findings from the National Surveys of Sexual Attitudes and Lifestyles (Natsal) Lancet. 2013;382:1781–1794. doi: 10.1016/s0140-6736(13)62035-8. PubMed DOI PMC

Kalick SM, Zebrowitz LA, Langlois JH, Johnson RM. Does human facial attractiveness honestly advertise health? Longitudinal data on an evolutionary question. Psychol. Sci. 1998;9:8–13. doi: 10.1111/1467-9280.00002. DOI

Jones BC, et al. Facial symmetry and judgements of apparent health: Support for a "good genes" explanation of the attractiveness-symmetry relationship. Evol. Hum. Behav. 2001;22:417–429. doi: 10.1016/s1090-5138(01)00083-6. DOI

Woodley of Menie, M. A. et al. Slow and steady wins the race: K positively predicts fertility in the USA and Sweden. Evol. Psychol. Sci.3, 109–117. 10.1007/s40806-016-0077-1 (2017).

Kington R, Lillard L, Rogowski J. Reproductive history, socioeconomic status, and self-reported health status of women aged 50 years or older. Am. J. Public Health. 1997;87:33–37. doi: 10.2105/ajph.87.1.33. PubMed DOI PMC

Doblhammer G, Oeppen J. Reproduction and longevity among the British peerage: The effect of frailty and health selection. Proc. R. Soc. B. 2003;270:1541–1547. doi: 10.1098/rspb.2003.2400. PubMed DOI PMC

Lawlor DA, et al. Is the association between parity and coronary heart disease due to biological effects of pregnancy or adverse lifestyle risk factors associated with child-rearing? Findings from the British women's heart and health study and the British regional heart study. Circulation. 2003;107:1260–1264. doi: 10.1161/01.cir.0000053441.43495.1a. PubMed DOI

Parikh NI, et al. Parity and risk of later-life maternal cardiovascular disease. Am. Heart J. 2010;159:215–221. doi: 10.1016/j.ahj.2009.11.017. PubMed DOI

Ryan CP, et al. Reproduction predicts shorter telomeres and epigenetic age acceleration among young adult women. Sci. Rep. 2018;8:11100. doi: 10.1038/s41598-018-29486-4. PubMed DOI PMC

Kaňková Š, Šulc J, Flegr J. Increased pregnancy weight gain in women with latent toxoplasmosis and RhD-positivity protection against this effect. Parasitology. 2010;137:1773–1779. doi: 10.1017/s0031182010000661. PubMed DOI

Case A, Fertig A, Paxson C. The lasting impact of childhood health and circumstance. J. Health Econ. 2005;24:365–389. doi: 10.1016/j.jhealeco.2004.09.008. PubMed DOI

Kuh DJL, Wadsworth MEJ. Physical health-status at 36 years in a British national birth cohort. Soc. Sci. Med. 1993;37:905–916. doi: 10.1016/0277-9536(93)90145-t. PubMed DOI

Eide ER, Showalter MH. Estimating the relation between health and education: What do we know and what do we need to know? Econ. Educ. Rev. 2011;30:778–791. doi: 10.1016/j.econedurev.2011.03.009. DOI

Behrman JR, Rosenzweig MR. Returns to birthweight. Rev. Econ. Stat. 2004;86:586–601. doi: 10.1162/003465304323031139. DOI

Black SE, Devereux PJ, Salvanes KG. From the cradle to the labor market? The effect of birth weight on adult outcomes. Q. J. Econ. 2007;122:409–439. doi: 10.1162/qjec.122.1.409. DOI

Almond D. Is the 1918 influenza pandemic over? Long-term effects of in utero influenza exposure in the post-1940 US population. J. Polit. Econ. 2006;114:672–712. doi: 10.1086/507154. DOI

Almond D, Edlund L, Palme M. Chernobyl's subclinical legacy: Prenatal exposure to radioactive fallout and school outcomes in Sweden. Q. J. Econ. 2009;124:1729–1772. doi: 10.1162/qjec.2009.124.4.1729. DOI

Nilsson, J. P. The Long-Term Effects of Early Childhood Lead Exposure: Evidence from the Phase-Out of Leaded Gasoline. (Uppsala University and Institute for Labor Market Policy Evaluation (IFAU), 2009).

Bleakley H. Disease and development: Evidence from hookworm eradication in the American South. Q. J. Econ. 2007;122:73–117. doi: 10.1162/qjec.121.1.73. PubMed DOI PMC

Rees DI, Sabia JJ. The effect of migraine headache on educational attainment. J. Hum. Resour. 2011;46:317–332.

Kessler RC, Foster CL, Saunders WB, Stang PE. Social consequences of psychiatric disorders, I. Educational attainment. Am. J. Psychiatry. 1995;152:1026–1032. doi: 10.1176/ajp.152.4.653-a. PubMed DOI

Miech RA, Caspi A, Moffitt TE, Wright BRE, Silva PA. Low socioeconomic status and mental disorders: A longitudinal study of selection and causation during young adulthood. Am. J. Sociol. 1999;104:1096–1131. doi: 10.1086/210137. DOI

Flegr J, Horáček J. Negative effects of latent toxoplasmosis on mental health. Front. Psychiatry. 2020 doi: 10.3389/fpsyt.2019.01012. PubMed DOI PMC

Kopecký, R., Boschetti, S. & Flegr, J. Effect of being religious on wellbeing in a predominantly atheist country: Explorative study on wellbeing, fitness, physical and mental health. PsyArXiv10.31234/osf.io/3kr6n (2019).

Flegr J, Horáček J. Toxoplasma-infected subjects report an obsessive-compulsive disorder diagnosis more often and score higher in obsessive-compulsive inventory. Eur. Psychiatry. 2017;40:82–87. doi: 10.1016/j.eurpsy.2016.09.001. PubMed DOI

Cohen, J. Statistical Power Analysis for the Behavioral Sciences. Revised edn. (Academic Press, 1977).

Armelagos GJ, Goodman AH, Jacobs KH. The origins of agriculture: Population growth during a period of declining health. Popul. Environ. 1991;13:9–22. doi: 10.1007/bf01256568. DOI

Lallo JW, Armelagos GJ, Mensforth RP. The role of diet, disease, and physiology in the origin of porotic hyperostosis. Hum. Biol. 1977;49:471–483. PubMed

Goodman AH, Armelagos GJ, Rose JC. Enamel hypoplasias as indicators of stress in three prehistoric populations from Illinois. Hum. Biol. 1980;52:515–528. PubMed

Angel JL. Porotic hyperostosis, anemias, malarias, and marshes in the prehistoric Eastern Mediterranean. Science. 1966;153:760–763. doi: 10.1126/science.153.3737.760. PubMed DOI

Eaton SB, Eaton SB, Konner MJ. Paleolithic nutrition revisited: A twelve-year retrospective on its nature and implications. Eur. J. Clin. Nutr. 1997;51:207–216. doi: 10.1038/sj.ejcn.1600389. PubMed DOI

Flegr J, Kuba R. The relation of Toxoplasma infection and sexual attraction to fear, danger, pain, and submissiveness. Evol. Psychol. 2016 doi: 10.1177/1474704916659746. DOI

Penke L, Asendorpf JB. Beyond global sociosexual orientations: A more differentiated look at sociosexuality and its effects on courtship and romantic relationships. J. Pers. Soc. Psychol. 2008;95:1113–1135. doi: 10.1037/0022-3514.95.5.1113. PubMed DOI

Sýkorová, K. & Flegr, J. Dataset to the study ‘Faster life history strategy manifests itself by lower age at menarche, higher sexual desire, and earlier reproduction in people with worse health’. igshare10.6084/m9.figshare.12100623.v1 (2020). PubMed PMC

R Core Team. R: A language and environment for statistical computing. http://www.R-project.org/ . Accessed September 2018. (2019).

Rosseel Y. lavaan: An R package for structural equation modeling. J. Stat. Softw. 2012;48:1–36. doi: 10.18637/jss.v048.i02. DOI

Epskamp S. semPlot: Unified visualizations of structural equation models. Struct. Equ. Model. 2015;22:474–483. doi: 10.1080/10705511.2014.937847. DOI

Redheaded women are more sexually active than other women, but it is probably due to their suitors

Toxoplasmosis is a risk factor for acquiring SARS-CoV-2 infection and a severe course of COVID-19 in the Czech and Slovak population: a preregistered exploratory internet cross-sectional study

Faster life history strategy manifests itself by lower age at menarche, higher sexual desire, and earlier reproduction in people with worse health