Heterosexuality and homosexuality playing different roles in evolution.

Last year I posted an interesting article how gay uncles play a supportive role in nieces and nephews, as a way to pass down their genes.

Over at Marriage Debate they cite a recent New York Times article how fertility attracts men or pushes them away.

THE THREATENING SCENT OF FERTILE WOMEN: NYTimes

It may seem hard to believe that men could distinguish a woman who’s at peak fertility simply by sitting next to her for a few minutes. Scientists long assumed that ovulation in humans was concealed from both sexes.

But recent studies have found large changes in cues and behavior when a woman is at this stage of peak fertility. Lap dancers get much higher tips (unless they’re taking birth-control pills that suppress ovulation, in which case their tips remain lower). The pitch of a woman’s voice rises. Men rate her body odor as more attractive and respond with higher levels of testosterone. ...