You hear it over and over again, but nothing is more attractive to a woman than a man who is confident. Maybe it's the remnants of our former proclivity for bad boys, but there's nothing that makes our loins ache more than a man who knows he's got it. There's something undeniably sexy about a man who is self-assured, and projects an air of being capable and in control. Maybe that's why Marnie on HBO's Girls sweats the guy who tells her, "The first time I fuck you, I might scare you a little."
Let us be clear. If you said that to any woman, ever, you would terrify her, and not in a sexy way. That is not something you should attempt to repeat. But it's worth pointing out that this guy makes her run into the bathroom to, uh, calm herself down, while her boyfriend's perpetual questioning ("Is this okay?") leaves her cold. Women want to sleep with someone who seems like he'll be able to handle himself, no inquiries or awkward advances necessary.