Some of the earliest known art is erotic
https://en.wikipedia.org/wiki/History_of_erotic_depictions#Early_depiction
Ley, D.J. Ethical Porn for Dicks: A Man’s Guide to Responsible Viewing Pleasure. ThreeL Media, Berkeley, CA, 2016. Pp. 17-20.
Evolution of sexual reproduction
https://en.wikipedia.org/wiki/Evolution_of_sexual_reproduction
Spewing sperm vs. nurturing offspring
Many sources make this case, but one of the best is Ogas Ogi’s and Sai Gaddam’s A Billion Wicked Thoughts (Plum, NY 2012).
University of Montreal scientists couldn’t find any men who hadn’t seen porn.
http://www.telegraph.co.uk/women/sex/6709646/All-men-watch-porn-scientists-find.html
https://www.sciencedaily.com/releases/2009/12/091201111202.htm
Porn in brothels and private homes in Pompeii
Clark, John, R. Roman Sex: 100 B.C to A.D. 250. Henry N. Abrams, NY, 2003.
The Song of Songs
https://en.wikipedia.org/wiki/Song_of_Songs
Fanny Hill
https://en.wikipedia.org/wiki/Fanny_Hill
Lumiere brothers
https://en.wikipedia.org/wiki/Auguste_and_Louis_Lumière
Porn during the Civil War
Lowry, Thomas P. The Story the Soldiers Wouldn’t Tell: Sex in the Civil War. Stackpole Books, Mechanicsburg, PA, 1994,
PornHub statistics, 2018
https://www.pornhub.com/insights/2018-year-in-review
Other estimates of porn use
Anon. “Where the Boys Are (Online),” New York Times, March 29, 2004.
Featherstone, L. “You and Me and Porn Makes Three,” Psychology Today, Sept./Oct. 2005.
Regnerus, M. et al. “Documenting Porn Use in America: A Comparative Analysis of Methodological Approaches,” Journal of Sex Research (2016) 53:873.
How much of the Internet is Porn?
www.covenanteyes.com/pornstats
http://enough.org/stats_porn_industry
www.forbes.com/sites/julieruvolo/2011/09/07/how-much-of-the-internet-is-actually-for-porn
https://cyber.harvard.edu/vaw02/mod2-3.htm
Ogas, O. and S. Gaddam. A Billion Wicked Thoughts: What the Internet Tells Us About Sex and Relationships. Plume, NY, 2012.
Wright, P.J. “U.S. Males and Pornography, 1973-2010: Consumption, Predictors, Correlates,” Journal of Sex Research (2013) 50:60.
Femme videos arouse women
Beggan, J.K. and S.T Allison. “Reflexivity in the Pornographic Films of Candida Royalle,” Sexualities (2003) 6:305.
Laan, E.et al. “Women’s Sexual and Emotional Responses to Male- and Female-Produced Erotica,” Archives of Sexual Behavior (1994) 23:153.
Mosher, D.L. and P. MacIan. “College Men and Women Respond to X-Rated Videos Intended for Male or Female Audiences: Gender and Sexual Scripts,” Journal of Sex Research (1994) 31:99.
Quackenbush, D.M. et al. “Gender Effects of Romantic Themes in Erotica,” Archives of Sexual Behavior (1995) 24:21.
The best discussion of porn and romance fiction as two sides of the same evolutionary coin
Ogas, O. and S. Gaddam. A Billion Wicked Thoughts: What the Internet Tells Us About Sex and Relationships. Plume, NY, 2012.
Pamela, Or Virtue Rewarded
https://en.wikipedia.org/wiki/Pamela%3B_or%2C_Virtue_Rewarded
Romances as leading category of fiction
https://en.wikipedia.org/wiki/Romance_novel
Romances as sex education
Weiner, J. “We Need Bodice-Ripper Sex Ed,” New York Times, Jan. 21, 2018.
Compared with men, women experience more arousal from stories
Scott, C.L. and A. Cortez, Jr. “No Longer His and Hers, but Ours: Examining Sexual Arousal in Response to Erotic Stories Designed for Both Sexes,” Journal of Sex and Marital Therapy (2011) 37:165.