do what comes naturally

do what comes naturally

euphemism To have sex. If he didn't come home from his date last night, I bet it's because he did what comes naturally.
See also: come, naturally, what
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

do what comes naturally

engage in sexual intercourse. informal euphemistic
See also: come, naturally, what
Farlex Partner Idioms Dictionary © Farlex 2017
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References in periodicals archive ?
Some will say the cat was only doing what comes naturally, but if he shows up here again I too will do what comes naturally. But will the robins have another try?