Same-sex behavior is widespread in primates and may help strengthen social bonds and improve survival under challenging ...

Nonhuman primates like bonobos and chimpanzees might engage in same-sex sexual activities to strengthen bonds, particularly ...

A new study posits that same-sex sexual behavior developed to help primates in complex social groups ease tension, reduce ...

The researchers found that same-sex behavior was more common in primate groups with clear hierarchical structures and those ...

Homosexual behavior in primates has a deep evolutionary basis and is more likely to occur in species that live in harsh ...

A simple neural change alters mating preferences in male butterflies, aiding rapid behavioral evolution, researchers report. A simple neural change alters mating preferences in male butterflies, ...

While many studies have looked at possible evolutionary links between men's strength and sexual behavior, a Washington State University study included data on women with a surprising result. Women, as ...