"I'd expect the mean man (no pun intended, and excluding those who never reproduce) to have 2-ish wives - that's what the "the average person is descended from

"I'd expect the mean man (no pun intended, and excluding those who never reproduce) to have 2-ish wives - that's what the "the average person is descended from twice as many women as men" quote is about." Surely you mean (ahem) the mean man-who-actually-reproduced.