Seven Questions

All sex facts / The animal kingdom

Dolphins were the case that settled an old argument

The question of whether animals feel pleasure had an anatomical answer.

Dolphins were the case that settled an old argument
Photo: Tony Hisgett from Birmingham, UK · CC BY 2.0 · Wikimedia Commons

It was assumed for a long time that non-human animals had sex for reproduction and nothing else. Dolphins have always been the awkward exception — they mate year-round, in same-sex pairings, outside any fertile window, and with evident persistence.

In 2022 a dissection study of bottlenose dolphin clitorises found large erectile bodies, an unusually dense supply of nerve endings, and thin skin over the surface — the same combination that in humans is understood to produce pleasure. The anatomy settled what the behaviour had suggested for fifty years.

Sources

Brennan et al., Current Biology (2022); Connor et al. (2000)

Related facts

General information, not medical advice. Anything persistent or painful belongs with a doctor, who has heard it before.