Well for me, it's anyone I see who is buying a drink at the bar. No attraction is necessary.

I don't go to the club empty handed, but I usually wait a little while to see if anyone is gonna offer me a drink. If it doesn't happen, then I just go get one myself.
Sometimes you have to coax on the sly. Example: If you see a guy buy a drink, say "Hey, what is the name of that drink?" or "OOh, that looks quite tasty!" But the trick is you have to look really interested. Maaaan, you'd be surprised how many dudes fall for that stuff!

I miss my clubbin days.