What constitutes “having sex”?

Sewell, K.K. and D. Strassberg. “How Do Heterosexual Undergraduate Students Define Having Sex? A New Approach to an Old Question,” Journal of Sex Research (2015) 52:507.

Sanders, S.A. and J.M. Reinisch. “Would You Say You “Had Sex” If…? Journal of the American Medical Association (1999) 281:275.

History of views concerning virginity


Tannahill, R. Sex in History. Stein & Day, NY, 1982.

The hymen




Foley, S. et al. Sex Matters for Women: A Complete Guide to Taking Care of Your Sexual Self (2nd ed.). Guilford Press, NY, 2011.

Joannides, P. The Guide to Getting It On. Goofy Foot Press, Oregon, 2009.

Neilsen, V. and C. Vyrdal. “Imperforate Hymen Can Cause Abdominal Pain and Primary Amenorrhea,” Ugeskr Laeger [Danish medical journal]. (2013) 175:1500.

Hymen restoration


An estimated 75 of women recall their first intercourse as not pleasurable

Lieblum, S. and J. Sachs. Getting the Sex You Want: A Woman’s Guide to Becoming Proud, Passionate and Pleased in Bed. Crown, NY, 2002.

First time forced—6.5 percent of women

Hawks, L. et al. “Association Between Forced Sexual Initiation and Health Outcomes Among U.S. Women,” JAMA Internal Medicine (2019) epub ahead of print.

Girls on losing it

Orenstein, P. Girls and Sex: Navigating the Complicated New Landscape. Harper, NY, 2016.

Marijuana: two-thirds of users report sexual enhancement


Many young women under-estimate young men willingness to use condoms.

Edwards, G.L. and B.L. Barber. “Women May Underestimate Their Partners’ Desire to Use Condoms: Possible Implications for Behavior,” Journal of Sex Research (2010) 47:59

Only 25 percent of women are reliably orgasmic during intercourse

Lloyd, E.A. The Case of the Female Orgasm: Bias in the Science of Evolution. Harvard University Press, Cambridge, MA, 2005.

Heiman, J. and J. LoPiccolo. Becoming Orgasmic. Fireside, 1987.

Puts, D.A. et al. “Why Women Have Orgasms: An Evolutionary Analysis,” Archives of Sexual Behavior (2012) 4:1127.

Becoming Orgasmic

Heiman, J. and J. LoPiccolo. Becoming Orgasmic. Fireside, 1987.



The importance of post-sex cuddling

Byers, E.S. “Relationship Satisfaction and Sexual Satisfaction: A Longitudinal Study of Individuals in Long-Term Relationships,” Journal of Sex Research (2005) 42:113.

Muise, A. et al. “Post-Sex Affectionate Exchanges Promote Sexual and Relationship Satisfaction,” Archives of Sexual Behavior (2014) 43:1391.

Prevalence of older virginity

Eisenberg, M. et al. “Who Is the 40-Year-Old Virgin and Where Did He/She Come From?” Journal of Sexual Medicine (2009) 6:2154.