@stavvers There is more to it than that. The pig fucking story was almost certainly made up. There was a group called The Pig Fondler's Guild that was somewhat notorious in student circles, it was a satirical revue known for somewhat extensive stunts. But Cameron was not a member, it wasn't even at Oxford (but many Oxon Tories knew us! heh...).
The reason Cameron couldn't sue for libel is he was a member of The Bullingdon Club which was a club for straight boys to hook up for gay sex (boarding school thing). The fact it was illegal for under 21 at the time making for a powerful bond between the members. Basically the faction all rose or fell together.