- it's my opinion that many guys date just for regular sex. In which case, legalised prostitution would mean a WHOLE lot less guys dating.
- some guys date out of peer pressure - their friends have girlfriends and it makes them more "acceptable" and a "man" to have a girlfriend even though they may not really want to - it just makes life easier and more comfortable.
Certainly everyone has their reasons for dating - and it's far from always being the wholesome "romantic" reasons that we pretend exist (for both men and women). In fact, I think the notion of romance is a kind of fairy story that greases the wheels of society. It blinds us from the harsher realities of dating: men like sex, women like security - and both sexes want to go on and procreate, and both sexes want social acceptance through dating. This is the essential reality - although of course you will have "outliers" but the generalisations remain true.
So guys on the rebound is no surprise.