If that's genetic testing of ancestors, it probably isn't the male population itself collapsing.

It's all women back then having sex with a select few men while everyone else turns incel. Which is kinda what I'm talking about. Get rid of institutions like marriage (i.e. sex slave housekeeper in the inflamed mind of retarded feminists) and the taboos that surround infidelity and you'll get this exact picture. All women having sex with a select group of men while everyone else turns incel. Except of course with birth control no one is going to be having children