Wait, I'm sorry... you're suggesting that prospectives should be told that Peterhouse has lots of gay people in? Apart from simly not being true afaik, it's an utterly ridiculous idea. Should you also tell people which colleges have lots of disabled people, lots of people from ethnic minorities, lots of religious people? That sounds like a fast-track to people segregating themselves.
Anyway, I'm off my gay soapbox for tonight, I think.