WASHINGTON — You fly more than 100 miles for love. You get rejected. You fly another 100 miles. Another rejection. And another. That’s the high-flying but futile sex life of the male pectoral ...

Some symbioses conform to the traditional one-on-one mode of symbiotic relationships, but it is increasingly understood that many symbioses are more open and consist of multiple associates with ...

Eyes may be the window to the soul, but our hands may offer a window into romantic faithfulness. In a new study published in Biology Letters, scientists at Oxford University set out to discover ...

People often ask what kind of human sexual relationship is most evolutionarily "natural." Is human nature adapted for promiscuity or long-term relationships, for example? And if we're wired for ...

A portion of the phylogenetic tree of the squirrel family (Sciuridae) illustrates how promiscuous ancestral species (black dots) gave rise to both monogamous species (blue dots) and polygynous species ...

“Promiscuous” is a term that is almost always used when speaking about a woman; it is most often pejorative. It refers to a woman—usually a young woman—who has sex frequently and casually. This ...

Like relationships, books can uncover knots in our psyches that might otherwise have remained obscured. Using myself as an example, I noticed that when speaking to friends about Helen DeWitt’s ...

In environments where mice compete for mates, the rule seems to be survival of the sexiest. Researchers have found that when female mice must compete with one another for mates, they bear sons that ...

Toxoplasma gondii — the cheery little brain parasite that turns men into slobbering goofuses and women into promiscuous sex kittens. The infection rate in humans, depending on the country, ranges from ...

Males are promiscuous and females are selective when choosing a mate, biologists have said for decades. But a new study finds it might not be that simple. The study, published in this month's issue of ...