If your encounter is truly no strings attached, is there a need to state that upfront? Not usually, says Kerner. “In general, I’d say don't define it -- that becomes about words, and sex is about actions,” he explains. But if you are having a one-night fling with an ex or a friend, that probably requires being clear up front, he says. After all, you don’t want him thinking this is the beginning of some great romance if it’s little more than a booty call. In this situation, Golland says, “Share your intent with your partner before becoming intimate, just to make sure you’re on the same page.” Then jump each other’s bones!