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Bats with weirdly giant penis have sex for up to 12 hours in a way never seen in mammals before


Serotine bats (Eptesicus serotinus) are the only mammals shown to engage in non-penetrative sex, also known as contact mating. (Image credit: Alona Shulenko)

Bats with “disproportionately large” penises that don’t fit inside the females’ vaginas are the only mammals known to have sex without penetration, scientists have discovered.

Mammals usually mate via penetrative sex, but serotine bats (Eptesicus serotinus) have evolved a different strategy. Instead of inserting their penis into the female’s vagina, males use their oversized genitalia to push aside their partner’s tail sheath, before pressing up against her vulva for up to 12 hours, according to a study published Monday (Nov. 20) in the journal Current Biology.

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