I agree that women who seem desperate are a turnoff... ones who are clearly trying to be sexy and seductive and not really succeeding.

I think if any of these women would just be confident and direct they would have MUCH better results. If you really want a one night stand with a guy, try approaching them, look them confidently and calmly in the eye, and without beating around the bush, bullshitting, or playing coy, just tell him you find him attractive and ask if he'd like to have sex with you. Being this simple and direct, I don't doubt that you would meet with success well over 90% of the time if you weren't bad looking. A lot of women who are seeking a one-night stand make the huge error of assuming men think like women do and are going to be turned off by directness. We don't need the stupid games and sleight of hand, if done right it can be enticing or exciting but just as often it can backfire. Being direct will make you stand out far more and requires less skill to pull off.