I think a big part of it is that college guys are young and want to have fun, more than most want a serious girlfriend who they feel obligated to do things for and to be a certain way for.
They can get all the booty they want without ever dating or committing (at least if they are decent-looking and friendly), so why tie yourself down to one girl?
College guys these days must be in heaven. A lot of girls will put out (at least to some extent) outside of a relationship...so why would a guy who's not looking to settle down anytime soon get himself into a committed situation?
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