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J. Maruthupandian and G. Marimuthu can't understand purpose of sex being rewarding for females.
The bats spent longer performing cunnilingus after copulation than before, so licking competitors sperm out can't possibly be the reason, but it gets proposed.
This foreplay may help arouse and lubricate females, the researchers said.
It's in the source article. Perhaps you could redirect your vitriol to OP instead of the researchers?
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