One of the most fascinating and informative articles I've ever read, from Jerry 'Sex and Censorship' Barnett. Not that I agree with everything in it, I especially doubt if his solutions for the present (like more free porn and prostitution) are solutions at all for men who want intimacy and love, and not just an orgasm. Also you may criticise him as being rather absolutist evolutionary. Still, I think his history and prehistory of male animals and men is an eye-opener. 'From a reproductive perspective, you may split op society in three classes: women, successful men and unsuccesful men.' https://areomagazine.com/2018/10/10/will-declining-monogamy-lead-to-an-increase-in-violence/