Theory: It's the homoeroticism. I was wondering if the lesbians were why, but the two guys going at it in the bathroom while a third watches probably wouldn't sit well with MTV's audience, to say nothing of their corporate benefactors. If it were just guy-girl action throughout, it'd probably be peachy. But guy on guy would bring down the misplaced wrath of the Religious Right (where are they, anyway? Did they give up on MTV?), worried about the propagation of the so-called homosexual agenda. To say nothing about losing the coveted homophobic-culturally-deprived-teenager demographic so coveted by marketers and yet endlessly and methodically deconstructed by society.
I find it very interesting that MTV (Who pretty much preach jackassery and hedonism as a religion) do all this censoring. The same MTV who shows hip-hop music videos that are pretty much landscapes composed entirely of bling, lowriders, and women in thongs, the same MTV who shows (as previously mentioned) Viva La Bam! and The Real World, censors this?
Who are they kidding, anyway? The teenagers who watch this stuff, convinced that whatever is shown represents the epitome of music culture, then run out and buy the placed products? The lobbyists concerned about corrupting the Youth Of America(tm)? The well-intentioned suburban mother that lets her children have TVs in their rooms?