Check also what wikipedia says about one night stands.
Depends on country and culture, somewhere people (both men and women) are very active in this kind of getting intimate with opposite (or same) gender so one night stands are very common.
The scammers spend their day trolling the dating sites and chat rooms for contact emails, and then send off thousands of fraudulent letters and emails awaiting the victim's replies.
They are offering the chance of finding true love and happiness, and there are plenty of takers!
Four Core Components The is a long-term, system-wide program for change involving program components at four levels.