WHEN observing cultures of Panagrolaimus rigidus to examine their life-history, copulation seemed to depend simply on chance encounters between males and females. However, as males often touched males ...

This isn't the first time we've highlighted a report of a bat species that engages in oral sex. However, this time it's the females that get the extra attention. First fellatio, and now cunnilingus: ...

Unstable copulation (right) due to mismatched genitalia in heterospecific mating between Drosophila suzukii and its sibling species. Stable copulation (left) between D. subpulchrella is shown for ...

Pseudo-copulation--an interaction that mimics sexual copulation--is a behavior known in mammalian communities that reduces aggression and signifies social dominance, particularly among males. However, ...