"Hey, baby... I know you're all over me and probably want to get to it... but you know what? I really don't think you've sufficiently reflected on the consequences of us having sex. You just think you want to have sex in the moment, but your decision process is biased because you've been led through a series of emotional states thanks to my seductive studliness. I'd like you to take a couple days, get a piece of paper, and write down the pros of us having sex on side, and the cons on the other. Then we will hang out, and I will act as unattractive as possible for an hour, because attractive behavior could bias you. This will help you make an objective decision about whether we should have sex or not. Now put your pants back on."

That got a laugh out of me.