You want a tip? Girls at uni will do ANYTHING to be popular. Social status within the class/year group is all-important. So they all need to accessorize with various things: gym membership, nights out, shoes, nice clothes, hippy/'nice' activity, keeping a superficial hand in all kinds of social circles basically. One of those accessories is a guy. Not just any guy, but a guy who has access to various social circles (politics, sports, all kinds of clubs) who is popular with the rest of the class or year group. Without a guy, her girl friends wonder what's wrong with her and begin to ostracise her. So be that guy.