Male circumcision, loss of sensation
“Circumcision also ablates junctional mucosa that appears to be an important component of the overall sensory mechanism of the human penis.”
Arguably the most important structure.
Of the female partner’s (sub-par) experience
The difference in sexual behavior in men is the real reason.
Rise in ED in other studies, check.
Rise in masturbation (read: needing porn), oral, anal and anal with other men, all expected.
Needing lubricant is the big deal, that fact alone would increase the risk of STDs it supposedly prevents.
Women, and adult men who knew both, preferred the natural, complete set.
Well, yes, that’s how we evolved, well done.