sexual attraction is for marriage, and pregnancy is good, not bad. when the man has more power, that is much more stable, he wants to keep her, she wants to be kept. when the woman does, there is less that keeps her from adultery, she won't respect him. yes, that teens are not considered adults is a defect of modern society. but modern society can't change this medieval-sounding dynamic between men and women, it is way too deeply rooted.