Mendiola, J., N. Jørgensen, A.-M. Andersson, A. M. Calafat, X. Ye, J. B. Redmon, E. Z. Drobnis, C. Wang, A. Sparks, S. W. Thurston, and S. H. Swan. 2010. Are Environmental Levels of Bisphenol A Associated with Reproductive Function in Fertile Men? Environm Health Perspect 118: 1286–1291.

Michael, R. P., and E. B. Keverne. 1971. An Annual Rhythm in the Sexual Activity of the Male Rhesus Monkey, Macaca mulatta, in the Laboratory. J Reprod Fertil 25: 95–98.

Michaelsen, K. F., L. Lauritzen, and E. L. Mortensen. 2009. Efects of Breastfeeding on Cognitive Function. Adv Exp Med Biol 639: 199–215.

Mieusset, R., and L. Bujan. 1994. The Potential of Mild Testicular Heating as a Safe, Efective and Reversible Contraceptive Method for Men. Int J Androl 17: 186–191.

Miller, J. F., E. Williamson, J. Glue, Y. B. Gordon, J. G. Grudzinskas, and A. Sykes. 1980. Fetal Loss After Implantation. Lancet 316: 554–556.

Milligan, L. A., and R. P. Bazinet. 2008. Evolutionary Modifications of Human Milk Composition: Evidence from Long-Chain Polyunsaturated Fatty Acid Composition of Anthropoid Milks. J Hum Evol 55: 1086–1095.

Milstein-Moscati, I., and W. Beçak. 1978. Down Syndrome and Frequency of Intercourse. Lancet 312: 629–630.

______. 1981. Occurrence of Down Syndrome and Human Sexual Behavior. Am J Med Genet 9: 211–217.

Mofett, A., and Y. W. Loke. 2006. Immunology of Placentation in Eutherian Mammals. Nature Rev Immunol 6: 584–594.

Moghissi, K. S. 1976. Accuracy of Basal Body Temperature for Ovulation Detec-tion. Fertil Steril 27: 1415–1421.

Møller, A. P. 1988. Ejaculate Quality, Testes Size and Sperm Competition in Primates. J Hum Evol 17: 479–488.

______. 1989. Ejaculate Quality, Testes Size and Sperm Production in Mammals. Funct Ecol 3: 91–96.

Montagu, A. 1961. Neonatal and Infant Immaturity in Man. JAMA 178: 56. Morrow-Tlucak, M., R. H. Haude, and C. B. Ernhart. 1988. Breastfeeding and Cognitive Development in the First 2 Years of Life. Soc Sci Med 26: 635–639.

Mortensen, E. L., K. F. Michaelson, S. A. Sanders, and J. M. Reinisch. 2002. The Association Between Duration of Breastfeeding and Adult Intelligence. J Am Med Ass 287: 2365–2371.

Mortimer, D. 1983. Sperm Transport in the Human Female Reproductive Tract. Oxford Rev Reprod Biol 5: 30–61.

Mulcahy, M. T. 1978. Down Syndrome and Parental Coital Rate. Lancet 312: 895. Munshi-South, J. 2007. Extra-Pair Paternity and the Evolution of Testis Size in a Behaviorally Monogamous Tropical Mammal, the Large Treeshrew (Tupaia tana). Behav Ecol Sociobiol 62: 201–212.

Münster, K., L. Schmidt, and P. Helm. 1992. Length and Variation in the Menstrual Cycle – A Cross-Sectional Study from a Danish County. Brit J Obstet Gynecol 99: 422–429.

Nadler, R. D. 1994. Walter Heape and the Issue of Estrus in Primates. Am J Primatol 33: 83–99.

Nathanielsz, P. W. 1998. Comparative Studies on the Initiation of Labor. Europ J Obstet Gynecol Reprod Biol 78: 127–132.

Nelson, C. M. K., and R. G. Bunge. 1974. Semen Analysis: Evidence for Chang-ing Parameters of Male Fertility Potential. Fertil Steril 25: 503–507.

Neugebauer, F. L. 1886. Eine bisher einzig dastehende Beobachtung von Polymas-tie mit 10 Brustwarzen. Zentralbl Gynäkol 10: 720–736.

Newman, J. 1995. How Breast Milk Protects Newborns. Sci Am 273 (12): 76–79. Oatridge, A., A. Holdcroft, N. Saeed, J. V. Hajnal, B. K. Puri, L. Fusi, and G. M.

Bydder. 2002. Change in Brain Size During and After Pregnancy: Study in Healthy Women and Women with Preeclampsia. Am J Neuroradiol 23: 19–26.

Odeblad, E. 1997. Cervical Mucus and Their Functions. J Irish Coll Phys Surg 26: 27–32.

Oftedal, O. T., and S. J. Iverson. 1995. Phylogenetic Variation in the Gross Composition of Milks. In The Handbook of Milk Composition, ed. R. G. Jensen, M. P. Thompson, and R. Jenness, 749–789. Orlando, FL: Academic Press.

O’Hara, M. W., and A. M. Swain. 1996. Rates and Risk of Postpartum Depression – A Metaanalysis. Int Rev Psychiatr 8: 37–54.

O’Rand, M. G., E. E. Widgren, S. Beyler, and R. T. Richardson. 2009. Inhibition of Human Sperm Motility by Contraceptive Antieppin Antibodies from Infertile Male Monkeys: Efect on Cyclic Adenosine Monophosphate. Biol Reprod 80: 279–285.

Papanicolaou, G. N. 1933. The Sexual Cycle of the Human Female as Revealed by Vaginal Smears. Am J Anat 52: 519–637.

Paraskevaides, E. C., G. W. Pennington, and S. Naik. 1988. Seasonal Distribution in Conceptions Achieved by Artificial Insemination by Donor. Brit Med J 297: 1309–1310.

Parazzini, F., M. Marchini, L. Luchini, L. Tozzi, R. Mezzopane, and L. Fedele. 1995. Tight Underpants and Trousers and the Risk of Dyspermia. Int J Androl 18: 137–140.

Parente, R. C. M., L. P. Bergqvist, M. B. Soares, and O. B. Moraes. 2011. The History of Vaginal Birth. Arch Gynecol Obstet 284: 1–11.

Parker, G. A. 1982. Why So Many Tiny Sperm? The Maintenance of Two Sexes with Internal Fertilization. J Theor Biol 96: 281–294.

Pawłowski, B. 1998. Why Are Human Newborns So Big and Fat? Hum Evol 13: 65–72.

______. 1999. Permanent Breasts as a Side Efect of Subcutaneous Fat Tissue Increase in Human Evolution. Homo 50: 149–162.

Pearson, J. A., R. E. M. Hedges, T. I. Molleson, and M. Özbek. 2010. Exploring the Relationship Between Weaning and Infant Mortality: An Isotope Case Study from Asikli Höyük and Cayönü Tepesi. Am J Phys Anthropol 143: 448–457.

Penrose, L. S., and J. M. Berg. 1968. Mongolism and Duration of Marriage. Nature 218: 300.

Pepper, G. V., and S. C. Roberts. 2006. Rates of Nausea and Vomiting in Pregnancy and Dietary Characteristics Across Populations. Proc Roy Soc Lond B 273: 2675–2679.

Piovanetti, Y. 2001. Breastfeeding Beyond 12 Months: An Historical Perspective. Pediatr Clin N Am 48: 199–206.

Plavcan, J. M. 2012. Sexual Size Dimorphism, Canine Dimorphism, and Male-Male Competition in Primates: Where Do Humans Fit In? Hum Nat 23: 45–67.

Poikkeus, P., M. Gissler, L. Unkila-Kallio, C. Hyden-Granskog, and A. Tiitinen. 2007. Obstetric and Neonatal Outcome After Single Embryo Transfer. Hum Reprod 22: 1073–1079.

Ponce de León, M. S., L. Golovanova, V. Doronichev, G. Romanova, T. Akazawa, O. Kondo, H. Ishida, and C. P. E. Zollikofer. 2008. Neanderthal Brain Size at Birth Provides Insights into the Evolution of Human Life History. Proc Natl Acad Sci USA 105: 13764–13768.