I imagine that places like Starbucks are good places to meet women who are interested in foreigners, but not quick lays. You approach, stimulate attraction, make her laugh, get her number, maximum 5 mins conversation and move on, unless you can drag the attraction longer by doing something with her. But that's the getting to know the girl to have fun with her later. I would imagine it's very difficult to have sex the same day you met a girl at Starbucks, thought of course it's bound to happen sometimes if you do it a lot, rarely though. DO correct me if I'm wrong, as I don't go to clubs and I am totally into day game and online.
Maria: you suggest going to the clubs at Roppongi you mentioned after midnight. Same for the pub (Hub)? Given those places I guess you suggest Roppongi instead of Shibuya.
Any efficient websites/apps for meeting girls or women (western or foreigner) who are up for fun (sex)? (I hear JapanCupid and Pairs are for serious relationships only so I am excluding these)