I think Antler Eater makes a good point with the hormone theory.It is probably most of the reason for the actions,not homosexuallity.The thing that came to my mind was, a dominance act.Dogs will dry hump other animals that are usually smaller, even small children or your leg.I learned a while back that it has nothing to do with sex, but dominance. With the dead Tom showing weakness the live tom was now showing that he was king of this" hill" .But the hormones probably played a part in this scene.And Congrats on the Tom