Just picture any hot woman you'd never approach, because you are SURE she must have a boyfriend, and if she doesn't, then there must be something wrong with her.
So if you're single and looking, the easiest way to connect with people you're attracted to is to approach them with no agenda. Become as sexually detached as you can and treat them like a buddy.
http://www.youtube.com/watch?v=_n2IVF9a2IA
and here:
Regular, socially outgoing men approach. It's nerds who talk themselves out of it. Think of salesmen. Salesmen start conversations with strangers all the time, and turn them into sales or network connections or women they sleep with that night. Starting conversations with strangers is for them the bread and butter of life. For nerds, it isn't.