10. Ackerley, R. et al. Human С-Tactile Afferents Are Tuned to the Temperature of a Skin-Stroking Caress. J. Neurosci. 34, 2879–2883 (2014).
11. Bancroft, J. The endocrinology of sexual arousal. J. Endocrinol. 186, 411–427 (2005).
12. Binetti, N., Harrison, C., Coutrot, A., Johnston, A. & Mareschal, I. Pupil dilation as an index of preferred mutual gaze duration. Royal Society Open Science 3, 160086 (2016).
13. Chan, W. F. N. et al. Male microchimerism in the human female brain. PloS One 7, e45592 (2012).
14. Chapman, D. D. et al. Virgin birth in a hammerhead shark. Biol. Lett. 3, 425–427 (2007).
15. Cohen, S., Janicki-Deverts, D., Turner, R. B. & Doyle, W. J. Does Hugging Provide Stress-Buffering Social Support? A Study of Susceptibility to Upper Respiratory Infection and Illness. Psychol. Sci. 26, 135–147 (2015).
16. Costa, R. M., Miller, G. F. & Brody, S. Women Who Prefer Longer Penises Are More Likely to Have Vaginal Orgasms (but Not Clitoral Orgasms): Implications for an Evolutionary Theory of Vaginal Orgasm. J. Sex. Med. 9, 3079–3088 (2012).
17. Felker, G. M. et al. Underlying causes and long-term survival in patients with initially unexplained cardiomyopathy. N. Engl. J. Med. 342, 1077–1084 (2000).
18. Finkelstein, J. S. et al. Gonadal Steroids and Body Composition, Strength, and Sexual Function in Men. N. Engl. J. Med. 369, 1011–1022 (2013).
19. Fisher, H. E., Aron, A., Mashek, D., Li, H. & Brown, L. L. Defining the brain systems of lust, romantic attraction, and attachment. Arch. Sex. Behav. 31, 413–419 (2002).
20. Frumin, I. et al. A social chemosignaling function for human handshaking. eLife 4 (2015).
21. Gallup, G. The human penis as a semen displacement device. Evol. Hum. Behav. 24, 277–289 (2003).
22. Gong, P., Liu, J., Li, S. & Zhou, X. Serotonin receptor gene (5-HT1A) modulates alexithymic characteristics and attachment orientation. Psychoneuroendocrinology 50, 274–279 (2014).
23. Hart, A. Ancient Egyptian grain-based pregnancy test found to be 70 % accurate by archaeologists. GroundReport (2009).
24. Herring, A. H., Attard, S. M., Gordon-Larsen, P., Joyner, W. H. & Halpem, С. T. Like a virgin (mother): analysis of data from a longitudinal, US population representative sample survey. BMJ 347, f7102-f7102 (2013).
25. Kara, R. J. et al. Fetal Cells Traffic to Injured Maternal Myocardium and Undergo Cardiac Differentiation Novelty and Significance. Circ. Res. 110, 82–93 (2012).
26. Khan, K. S. & Chaudhry, S. An evidence-based approach to an ancient pursuit: systematic review on converting online contact into a first date. Evid. Based Med. 20, 48–56 (2015).
27. Kirshenbaum, S. The Science of Kissing: What Our Lips Are Telling Us. Grand Central Publishing (2011).
28. Kort, R. et al. Shaping the oral microbiota through intimate kissing. Microbiome 2, 41 (2014).
29. Liu, J., Gong, P. & Zhou, X. The association between romantic relationship status and 5-HT1A gene in young adults. Sci. Rep. 4, 7049 (2014).
30. Mautz, B. S., Wong, В. В. M., Peters, R. A. & Jennions, M. D. Penis size interacts with body shape and height to influence male attractiveness. Proc. Natl. Acad. Sci. 110, 6925–6930 (2013).