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"You've had sex," says Grantaire, just to clarify. He gives Enjolras an obvious look up and down, as if he's trying to imagine it right now: Enjolras having sex, Enjolras in the act of having sex. The curve of his mouth gives away his smirk; it's Grantaire though, so his smirk is two-thirds mocking and one-third self-deprecating.
In which Enjolras has sex, has casual sex, and doesn't talk about it; in which Grantaire speaks better through art.