Multiple fathers prevalent in Amazonian cultures

In modern culture, it is not considered socially acceptable for married people to have extramarital sexual partners. However, in some Amazonian cultures, extramarital sexual affairs were common, and people believed that when ...

Faithful females key to evolution of bird societies

(PhysOrg.com) -- Females with fewer sexual partners can explain where bird species have evolved to cooperate in the rearing of their young, according to Oxford University research.

Single women gaze longer

A study by neuroscientist Heather Rupp and her team found that a woman's partner status influenced her interest in the opposite sex.

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