Decided to try to explain some developmental theories to myself, and maybe somebody can learn from it. Not today, but step by step.

Sexual Development

http://www.agner.org/cultsel/chapt10/

Grooming

https://books.google.ch/books?id=Jj_qOAftGqAC&pg=PA173&dq=On+the+Evolution+of+Human+Behavior+reynolds+self+grooming&hl=de&sa=X&ved=0ahUKEwiXg-yV4NTMAhUEKywKHUqpBXoQ6AEIJjAA#v=onepage&q=On%20the%20Evolution%20of%20Human%20Behavior%20reynolds%20self%20grooming&f=false

Violence

http://www.violence.de/prescott/bulletin/article.html

Advertisements