Lijeros, F., C. R. Edling, L. A. N. Amaral, H. E. Stanley, and Y. Åberg. 2001. The Web of Human Sexual Contacts. Nature 411: 907–908.
Linzenmeier, G. 1947. Zur Frage der Empfängniszeit der Frau: Hat Knaus oder Stieve recht? Zentralbl Gynäkol 69: 1108–1110.
Lloyd, J., N. S. Crouch, C. L. Minto, L.-M. Liao, and S. M. Creighton. 2005. Female Genital Appearance: “Normality” Unfolds. Brit J Obstet Gynaecol 112: 643–646.
Lönnerdal, B. 2000. Breast Milk: A Truly Functional Food. Nutrition 16: 509–511.
Lopata, A. 1996. Implantation of the Human Embryo. Hum Reprod 11 (Suppl. 1): 175–184.
Loucks, A. B., and L. M. Redman. 2004. The Efect of Stress on Menstrual Function. Trends Endocrinol Metab 15: 466–471.
Loudon, A. S. I., A. S. McNeilly, and J. A. Milne. 1983. Nutrition and Lactational Control of Fertility in Red Deer. Nature 302: 145–147.
Loy, J. 1987. The Sexual Behavior of African Monkeys and the Question of Estrus. In Comparative Behavior of African Monkeys, ed. E. Zucker, 175–195. New York: Alan Liss.
Luckett, W. P. 1974. The Comparative Development and Evolution of the Placenta in Primates. Contrib Primatol 3: 142–234.
MacDorman, M. F., F. Menacker, and E. Declercq. 2008. Cesarean Birth in the United States: Epidemiology, Trends, and Outcomes. Clin Perinatol 35: 293–307.
MacLeod, J., and R. Z. Gold. 1951. The Male Factor in Fertility and Infertility. II. Spermatozoon Counts in 1000 Men of Known Fertility and 1000 Cases of Infertile Marriage. J Urol 66: 436–449.
______. 1957. The Male Factor in Fertility and Infertility. IX. Semen Quality in Relation to Accidents of Pregnancy. Fertil Steril 8: 36–49.
MacLeod, J., and R. S. Hotchkiss. 1941. The Efect of Hyperpyrexia upon Spermatozoa Counts in Men. Endocrinology 28: 780–784.
MacLeod, J., and Y. Wang. 1979. Male Fertility Potential in Terms of Semen Quality. A Review of the Past, a Study of the Present. Fertil Steril 31: 103–116.
Macomber, D., and M. B. Sanders. 1929. The Spermatozoa Count. N Engl J Med 200: 981–984.
Málek, J., J. Gleich, and V. Maly. 1962. Characteristics of the Daily Rhythm of Menstruation and Labor. Ann NY Acad Sci 98: 1042–1055.
Mancuso, P. J., J. M. Alexander, D. D. McIntire, E. Davis, G. Burke, and K. J. Leveno. 2004. Timing of Birth After Spontaneous Onset of Labor. Obstet Gyn-aecol 103: 653–656.
Mann, D. R., and H. M. Fraser. 1996. The Neonatal Period: A Critical Interval in Male Primate Development. J Endocrinol 149: 191–197.
Marshall, J. 1968. Congenital Defects and the Age of Spermatozoa. Int J Fertil 13: 110–120.
Martin, R. D. 1968. Reproduction and Ontogeny in Tree-Shrews (Tupaia be-langeri) with Reference to Their General Behaviour and Taxonomic Relationships. Z Tierpsychol 25: 409–532.
______. 1969. The Evolution of Reproductive Mechanisms in Primates. J Reprod Fertil Suppl 6: 49–66.
______. 1981. Relative Brain Size and Metabolic Rate in Terrestrial Vertebrates. Nature 293: 57–60.
______. 1984. Scaling Efects and Adaptive Strategies in Mammalian Lactation.
Symp Zool Soc Lond 51: 87–117.
______. 1992. Female Cycles in Relation to Paternity in Primate Societies. In Paternity in Primates: Genetic Tests and Theories. Implications of Human DNA Fingerprinting, ed. R. D. Martin, A. F. Dixson, and E. J. Wickings, 238–274. Basel: Karger.
______. 1996. Scaling of the Mammalian Brain: The Maternal Energy Hypothesis. News Physiol Sci 11: 149–156.
______. 2003. Human Reproduction: A Comparative Background for Medical Hypotheses. J Reprod Immunol 59: 111–135.
______. 2007. The Evolution of Human Reproduction: A Primatological Perspec-tive. Yearb Phys Anthropol 50: 59–84.
______. 2008. Evolution of Placentation in Primates: Implications of Mammalian Phylogeny. Evol Biol 35: 125–145.
______. 2012. Primer: Primates. Curr Biol 22: R785–R790.
Martin, R. D., and K. Isler. 2010. The Maternal Energy Hypothesis of Brain Evolution: An Update. In The Human Brain Evolving: Paleoneurological Studies in Honor of Ralph L. Holloway, ed. D. Broadfield, M. Yuan, K. Schick, and N. Toth, 15–35. Bloomington, IN: Stone Age Institute Press.
Martin, R. D., and A. M. MacLarnon. 1985. Gestation Period, Neonatal Size and Maternal Investment in Placental Mammals. Nature 313: 220–223.
______. 1988. Comparative Quantitative Studies of Growth and Reproduction. Symp Zool Soc Lond 60: 39–80.
Martin, R. D., L. A. Willner, and A. Dettling. 1994. The Evolution of Sexual Size Dimorphism in Primates. In The Dif erences Between the Sexes, ed. R. V. Short and E. Balaban, 159–200. Cambridge: Cambridge University Press.
Matsuda, S., and H. Kahyo. 1992. Seasonality of Preterm Births in Japan. Int J Epidemiol 21: 91–100.
McCance, R. A., M. C. Luf, and E. E. Widdowson. 1937. Physical and Emotional Periodicity in Women. J Hygiene 37: 571–611.
McCoy, S. J. B., J. M. Beal, S. B. M. Shipman, M. E. Payton, and G. H. Watson. 2006. Risk Factors for Postpartum Depression: A Retrospective Investigation at 4-Weeks Postnatal and a Review of the Literature. J Am Osteopath Assoc 106: 193–198.
McGrath, J. J., A. G. Barnett, and D. W. Eyles. 2005. The Association Between Birth Weight, Season of Birth and Latitude. Ann Hum Biol 32: 547–559.
McKenna, J. J., H. L. Ball, and L. T. Gettler. 2007. Mother-Infant Cosleeping, Breastfeeding and Sudden Infant Death Syndrome: What Biological Anthropology Has Discovered About Normal Infant Sleep and Pediatric Sleep Medicine. Yearb Phys Anthropol 45: 133–161.
McKeown, T., and J. R. Gibson. 1951. Observations on All Births (23,970) in Birmingham, 1947. II: Birth Weight. Brit J Soc Med 5: 98–112.
______. 1952. Period of Gestation. Brit Med J 1: 938–941.
McKeown, T., and R. G. Record. 1952. Observations on Foetal Growth in Multiple Pregnancy in Man. J Endocrinol 8: 386–401.
McNeilly, A. S. 2001. Lactational Control of Reproduction. Reprod Fert Dev 13: 583–590.
McTiernan, A., and D. B. Thomas. 1986. Evidence for a Protective Efect of Lactation on Risk of Breast Cancer in Young Women. Results from a Case Control Study. Am J Epidemiol 124: 353–358.
Menacker, F., and B. E. Hamilton. 2010. Recent Trends in Cesarean Delivery in the United States. NCHS Data Brief 35: 1–8.
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.
Procopé, B.-J. 1965. Efect of Repeated Increase of Body Temperature on Human Sperm Cells. Int J Fertil 10: 333–339.
Profet, M. 1993. Menstruation as a Defence Against Pathogens Transported by Sperm. Quart Rev Biol 68: 335–386.