This article researched genetic traits of volunteers from around the world:
https://psmag.com/8-000-years-ago-17-women-reproduced-for-every-one-man-6d41445ae73d#.arkqxux04

They reached the conclusion that during certain periods of time reproduction ratios were as high as 17:1 female to male. During other periods the numbers were 5:1.

Lesson learned: The upper level of men get more sexual access. ALSO - Years ago when TRP claimed an "80/20" rule, we now know they were not exaggerating; we were optimistically representing the most equal time in history!

Second lesson: Lift, improve, lift, improve. Men are wired for achievement, and women are wired to recognize it.