There's nothing wrong with having standards when it comes to men. But I think your mistake with the guy in Chiang Mai was that you only considered whether he made you lust or pine after him. You might have missed the perfect opportunity to meet an interesting person or even make a new friend!
Sex is great, but it's not necessarily something people should chase just for the sake of it. What most people are seeking is connection.
RE: I don't feel any lust anymore