Sources:

Sex Differences in Response to Visual Sexual Stimuli: A Review

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2739403/

20 Mind-Blowing Stats About The Porn Industry And Its Underage Consumers

https://fightthenewdrug.org/10-porn-stats-that-will-blow-your-mind/

Pornography and Public Health Research Summary

http://endsexualexploitation.org/wp-content/uploads/NCOSE_Pornography-PublicHealth_ResearchSummary_8-2_17_FINAL-with-logo.pdf

How Self-Esteem Influences Risky Sexual Behavior in Teens

https://www.verywellmind.com/teen-self-esteem-and-risky-sexual-behavior-1065482

Men who are physically strong are more likely to have right wing political views

https://www.dailymail.co.uk/health/article-2325414/Men-physically-strong-likely-right-wing-political-views.html

Sperm Counts Continue to Fall

https://www.theatlantic.com/family/archive/2018/10/sperm-counts-continue-to-fall/572794/

You're Not The Man Your Father Was

https://www.forbes.com/sites/neilhowe/2017/10/02/youre-not-the-man-your-father-was/#3e23843e8b7f

Effects of gendered behavior on testosterone in women and men

https://www.pnas.org/content/112/45/13805.full

Effects of competition outcome on testosterone concentrations in humans: An updated meta-analysis.

https://www.ncbi.nlm.nih.gov/pubmed/27720891

How Welfare Undermines Marriage and What to Do About It

https://www.heritage.org/welfare/report/how-welfare-undermines-marriage-and-what-do-about-it