I think it was the fact that he was naked. I think it's kind of tasteless (pun not intended), but I don't feel particularly offended. He was naked on the cross, after all.
Doing it up in chocolate is kind of a weird media, but oh well. I'm trying desperately to keep my mind out of the gutter about what happens as one eats their way through the chocolate anatomy [Jae failz, loses a Purity Point]