Zeta is not really a pick-up place, and my guess is neither are She's or Lick. The tom-dy-les club scene here is more a social thing to do with friends, rather than a sex thing. I go to Zeta because I like the friends I go with, because I like to make new friends, and I like the friends I have made among the staff there.
Although Zeta's future seems uncertain now that it is under new management (and I know most here are probably shocked because I have always been a strong defender of Zeta but my next visit could well be my last), but for me it has always a good place to go and have a few beers or get a bottle of Johnny Walker, sometimes people come over and talk to me, ask where I am from, but my experience is it would not be a good place to find a pick up. Aside from language issues it is just not it's nature. Actually I have found people coming up to me are more likely if I am with a Thai friend.
As Need2beloved notes, u can certainly find hookers. There seems a high degree of fluidity here regarding sexuality, but I would not advice hookers albeit for a different reason, the high level of STDs including HIV among sex workers. If you do link up with a hooker be certain to take that into consideration and use safe-sex measures.
As she also notes the Vibe party is the first Saturday each month {usually). Again I don't think it is a thing geared to just meet someone for a casual encounter, but one never knows. If you met someone like-minded it could happen.
Other folks maybe wanna weigh in with other views? Mine, solely reflect Duangkamol's only.