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When fruit flies are infected with the Wolbachia bacteria, their sex lives—and ability to reproduce—change dramatically.

Robin Rinaldi should sue her marriage counselor. When she was in her mid-30s and engaged to be married to a man several years older, Rinaldi, the author of a new book called “The Wild Oats ...

"Slutty" behavior is good for the species. That's the conclusion of a new wave of research on the evolutionary drives behind sexuality and parenting. Women everywhere have been selflessly engaging ...

David Brooks’s argument for gay marriage begins with a characterization of sexual promiscuity as spiritually deadening. Gay marriage is worth supporting, on his view, either because it would ...

Men were raping women long before the sexual revolution. Rapists got away with their crimes with the law's blessing.

But I also think that society will become more tolerant of what might be called dignified promiscuity: open relationships and marriages, where the negative externalities of promiscuity are dealt ...

Good news for fans of polyandry, which is the practice of females mating with multiple males in species from mammals to insects: You may hold in your hands - or loins, maybe - the key for the ...

A new study suggests there may be a biological reason for infidelity. A group of New York researchers say it's all in the genes -- and not your blue ones.

By and large, I believe promiscuity is not an end - but a means. Promiscuous people, both men and women, have a strong need and desire for attention.

Gay-marriage advocates often argue that marriage will reduce the gay male tendency toward promiscuous sex. I have often suggested that a different and more disturbing effect is more likely. Since m… ...