Personally, I think they should've stopped it here after the third one also. With each series, the producers have gotten more and more desperate for ratings, which have been dropping with each series. This year, I think they're at their most desperate with the glass doors in the toilets.
Also, over here, a newspaper usually offers a sum of money to the first couple to have sex in the Big Brother house. This year, they purposely haven't supplied enough beds, forcing people to share a single bed, and hoping that'll get people to have sex...