Never should you EVER approach it like that if you're not dating off of a fetish site. Find someone here, discuss immediately, find someone at wherever you pick people up, you should probably wait.
With non-fetish site dating, you should probably wait until you've had sex, or discuss having sex. Be honest, and make compromises. If they're not into it, they're not into it, sorry. Don't push it. You'll know when continuing on about it is too much.
I wouldn't suggest getting people drunk for it. Either doing it or confessing, definitely doesn't put you in the right frame of mind, nor does it put them there.
Marth,
I know this is going to be harsh, but if you need to get someone drunk to talk to them, or need alcohol to talk to people, then you do not have the most important thing any dom has to offer.
It might sound weird, but it indicates that you lack self confidence. The major thing any dom has going is self confidence. It's the biggest selling point, the security and knowledge that you are what you are, and you are going to be your partner's unmovable rock. It may sound sappy, but that's what doms bring among their other talents, abilities, and traits.
Ghille,
Show some respect for yourself, and women. I'd also suggest not going to the red light district to pick up people if you are going to worry about them being prostitutes.