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Copulation duration in Cynopterus sphinx according to whether the female licks the male’s penis (Licking) or not (No licking).
We found that female short-nosed fruit bats C. sphinx lick their mate’s penis regularly during copulation, and that each second of licking results in approximately 6 extra seconds of copulation. Copulations also last longer if licking occurs than when no licking takes place. Our observations are the first to show regular fellatio in adult animals other than humans.
From an article on fruit bat fellatio.
