Biting?
That's nuffin!
http://en.wikipedia.org/wiki/John_Hopoate

During a 2001 clash with the Cowboys, Hopoate, in an attempt to unsettle several of his opponents, inserted his finger in three players' anuses, the first occurring during the seventh minute of play. At the conclusion of the match the matter was immediately referred to the rugby league judiciary where a case was put forward from both sides on 28 March.
Hopoate claimed in front of the panel of judges that he was simply attempting to give all three players "a wedgie" with his fingers, denying he had done anything wrong and that he was "a great believer in what happens on the field should stay there".
The three victims in the case, Cowboys players Glenn Morrison, Peter Jones and Paul Bowman all disagreed with the reasoning put forward by Hopoate and his team. Jones stated, "It wasn't a wedgie. That's when your pants are pulled up your arse. I think I know the difference between a wedgie and someone sticking their finger up my bum", while Bowman stated that he was "disgusted" and "couldn't believe it."