seriously, why does this question keep popping up?? someone needs to write a how to on RJ!!
You walk up to them, you introduce your self "Hi, I'm joe blow" you offer your hand (cause umm, ya do, I know Danisnotirritating, it's soooo backwards and shit and bla bla bla) usually that will prompt them to give you there name, you make idle chit chat, deliver a few well chosen compliments and boom, he's back at your place on his knees begging for more!
Oh I jest, sorta, except for the ending up at your place bit that's pretty much how it's done.
I like what DCEric wrote, it's very true, fake it, eventually you'll be doing it happily and it will be part of you to do that!