Bullough, V, and J. Brundage. Handbook of Medieval Sexuality. New York: Garland, 2000.

Burri, A., and T Spector. The Genetics of Sexual Behavior. Behavioral Genetics, May 2008.

Cherkas, L., et al. Genetic Influences on Female Infidelity and Number of Sexual Partners in Humans: A Linkage and Association Study of the Role of the Vasopressin Receptor Gene (AVPR1A). Twin Research, December 2004.

Coontz, S. Interview with the authors, December 14, 2011.

Delhey, K., et al. Paternity Analysis Reveals Opposing Selection Pressures on Crown Coloration in the Blue Tit. Proceedings of The Royal Society B, October 2003.

Diekhof, E., and O. Gruber. When Desire Collides with Reason: Functional Interactions Between Anteroventral Prefrontal Cortex and Nucleus Accumbens Underlie the Human Ability to Resist Impulsive Desires. Journal of Neuroscience, January 27, 2010.

Durante, K., and N. Li. Oestradiol Level and Opportunistic Mating in Women. Biology Letters, April 23, 2009.

Ebstein, R., et al. Genetics of Social Behavior. Neuron, March 25, 2010.

Fidler, A., et al. DRD4 Gene Polymorphisms Are Associated with Personality Variation in a Passerine Bird. Proceedings of The Royal Society B, July 22, 2007.

Fiorino, D., et al. Dynamic Changes in Nucleus Accumbens Dopamine Efflux During the Coolidge Effect in Male Rats. Journal of Neuroscience, June 15, 1997

Foerster, K., et al. Females Increase Offspring Heterozygosity and Fitness Through Extra-Pair Matings. Nature, October 16, 2003.

Forstmeier, W., et al. Female Extrapair Mating Behavior Can Evolve via Indirect Selection on Males. Proceedings of the National Academy of Sciences, June 28, 2011.

French, J. Presentation, Workshop on the Biology of Prosocial Behavior, Emory University, October 23–24, 2011.

Gangestad, S., et al. Women's Sexual Interests Across the Ovulatory Cycle Depend on Primary Partner Developmental Instability. Proceedings of the Royal Society B, August 17, 2005.

Gangestad, S., et al. Changes in Women's Sexual Interests and Their Partners' Mate-Retention Tactics Across the Menstrual Cycle: Evidence for Shifting Conflicts of Interest. Proceedings of the Royal Society B, April 22, 2002.

Garcia, J., et al. Associations Between Dopamine D4 Receptor Gene Variation with Both Infidelity and Sexual Promiscuity. PLoS One, November 30, 2010.

Garland, R. The Greek Way of Life. Ithaca, NY: Cornell University Press, 1990.

Gjedde, A., et al. Inverted-U-Shaped Correlation Between Dopamine Receptor Availability and Striatum and Sensation Seeking. Proceedings of the National Academy of Sciences, February 23, 2010.

Gratian // http://www.fordham.edu/halsall/source/gratianl.asp.

Hammock, E., and L. Young. Microsatellite Instability Generates Diversity in Brain and Sociobehavioral Traits. Science, June 10, 2005.

Havens, M., and J. Rose. Investigation of Familiar and Novel Chemosensory Stimuli by Golden Hamsters: Effects of Castration and Testosterone Replacement. Hormones and Behavior, December 1992.

Heinrichs, M. Interview with the authors, March 30, 2011.

Hostetler, C, et al. Neonatal Exposure to the D1 Agonist SKF38393 Inhibits Pair Bonding in the Adult Prairie Vole. Behavioral Pharmacology, October 2011.

Johnston, R., and K. Rasmussen. Individual Recognition of Female Hamsters by Males: Role of Chemical Cues and of the Olfactory and Vomeronasal Systems. Physiology and Behavior, July 1984.

Jordan, L., and R. Brooks. The Lifetime Costs of Increased Male Reproductive Effort: Courtship, Copulation, and the Coolidge Effect. Journal of Evolutionary Biology, November 2010.

Kinsey Institute for Research in Sex, Gender, and Reproduction // http://www.iub.edu/~kinsey/resources/FAQ. html#frequency.

Koene, J., and A. Ter Maat. Coolidge Effect in Pond Snails: Male Motivation in a Simultaneous Hermaphrodite. BMC Evolutionary Biology, November 2007.

Korsten, P., et al. Association Between DRD4 Gene Polymorphism and Personality Variation in Great Tits: A Test Across Four Wild Populations. Molecular Ecology, January 2011.

Lammer, J., et al. Power Increases Infidelity Among Men and Women. Psychological Science, July 2011.

Laumann, E., et al. The Social Organization of Sexuality. Chicago: University of Chicago Press, 1994.

Lysias. On the Murder of Eratosthenes. English translation by W. R. M. Lamb. Cambridge, MA: Harvard University Press, 1930 // http://www.perseus.tufts.edu/hopper/text??doc=Perseus%3Atext%3A1999.01.0154%3Aspeec%3Dl.

McIntyre, M., et al. Romantic Involvement Often Reduces Men's Testosterone Levels – But Not Always: The Moderating Role of Extrapair Sexual Interest. Journal of Personality and Social Psychology, October 2009.

Ophir, A., et al. Variation in Neural V1aR Predicts Sexual Fidelity and Space Use Among Male Prairie Voles in Semi-Natural Settings. Proceedings of the National Academy of Sciences, January 29, 2008.

Patrick, S., et al. Promiscuity, Paternity, and Personality in the Great Tit. Proceedings of The Royal Society B, November 30, 2011.

Pfaus, J. Interview with the authors, June 8–9, 2011.

Pine, A., et al. Dopamine, Time and Impulsivity in Humans. Journal of Neuroscience, June 30, 2010.

Pruessner, J., et al. Dopamine Release in Response to a Psychological Stress in Humans and Its Relationship to Early Life Maternal Care: A Positron Emission Tomography Study Using [11C] Raclopride. Journal of Neuroscience, March 17, 2004.

Rupp, H., et al. Partner Status Infl uences Women's Interest in the Opposite Sex. Human Nature, March 1, 2009.

Ryan, C, and C. Jetha // http://www.sexatdawn.com/page4/page4.html.

Schmitt, D., et al. Patterns and Universale of Mate Poaching Across 53 Nations: The Effects of Sex, Culture, and Personality on Romantically Attracting Another Person's Partner. Journal of Personality and Social Psychology, April 2004.

Schoebi, D., et al. Stability and Change in the First 10 Years of Marriage: Does Commitment Confer Benefits Beyond the Effects of Satisfaction? Journal of Personality and Social Psychology, November 21, 2011.

Solomon, N. Polymorphism at the avpr1a locus in male prairie voles correlated with genetic but not social monogamy in field populations. Molecular Ecology, November 2009.

Steiger, S., et al. The Coolidge Effect, Individual Recognition and Selection for Distinctive Cuticular Signatures in a Burying Beetle. Proceedings, Biological Sciences, the Royal Society B, August 2008.