Of course Jack was... curious about what Ennis looked like, this way. The man he loved was a woman- any man in his right mind would be interested. But there it was- he was only that excited, because under the brests and 'everything', it was Ennis.
Still, since it was Ennis, he knew better than to push, finally just shucking his pants and stepping in the shower. He didn't bother shutting the door and steaming himself- perhaps half-hoping Ennis would get curious enough to join him.