https://www.youtube.com/watch?v=sZ_fHrCQOGY

Skip to 5:00 to get started.

Try to ignore the idiot comments from Cenk the interviewer. It's pretty long but worth a watch, the interviewee talks about the evidence pointing towards humans being completely non-monogamous, from penis and testicular size compared to other primates to monogamy only starting from the rise of agriculture and men needing a way to ensure that his property and land was being passed on to his sons and not his neighbors who his baby mama cuckolded him for.

Near the end he talks about how he believes that human testicle size has actually shrunk since the rise of agriculture do to the introduction of monogamy into our society, apparently our testicles are more efficient compared to there size than they should be indicating that they used to be bigger like those of chimps and bonobos.

There's a lot of other cool points he makes. It seems like something TRP would be interested in, give it a watch if you have time.