Roughly half of all married men pursue some extramarital mating over their lifetime, and for those who do, liaisons occur at the expense of sex with their wives. Some men continue throughout life to compete for new mates, divorcing older wives and marrying younger women. Long attributed by traditional scientists to the fragile male ego, to psychosexual immaturity, to “male menopause,” or to a culture of youth, men’s effort to mate with younger women as they age instead reflects a universal evolved desire that does not go away.
