A female contestant was raped live on tv, by another male housemate, when the woman was drunk, so the man felt he could hop right in.
http://www.thefirstpost.co.uk/index.php?storyID=9400
http://jezebel.com/gossip/live-nude-rape!/big-brother-africas-resident-rapist-still-the-favorite-to-win-the-100-grand-318435.php