How non-monogamous relationships find success

Individuals in polyamorous relationships report more commitment and investment with their primary partners and report more time spent on sex with their secondary partners, a new study authored by Western researchers has found.

Male extinction prevented by promiscuous females

Female fruit flies with a large number of sexual partners are playing an invaluable role in preventing the extinction of males, research at the University of Liverpool has shown.

Many US women have children by more than one man

The first national study of the prevalence of multiple partner fertility shows that 28 percent of all U.S. women with two or more children have children by more than one man.

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 ...