Capital is built upon the foundation of strictly enforced gender roles, men enfocring monogamy so they could be sure who their sons were, to consolidate wealth in their family

read the Origin of the Family, Private Property and the State, or there’s a shorter section about it in Transgender Warriors

wow prole wiki was the 4th result when I searched for this book

https://en.prolewiki.org/wiki/Library:Transgender_Warriors