They're being a bit prickly about it, but using quotes like that certainly implied to me as reader that it was meaning a suggestive usage, which doesn't make sense since the plaintext version already means fucking. I mean I understood their meaning and realized they were just unnecessary quotation marks quickly, but I also at first wondered if there was some sort of third meaning beyond rest or sex that was being suggested by the marks, so I kind of feel like the reaction to them here is a bit overblown.