That's fair. I can see how it might be difficult to design the levels around being able to play through them as a human or as a werewolf.
One interesting option could still be to see a lycan or werewolf transformation occur as a sort of a bad end/game over state for a sex scene if you're defeated in combat or by a specific enemy, after which you'd have to reload back to a checkpoint. Just a thought, personally I felt that having it be a chance based thing in the prison was a really cool idea and could make for a cool "game over" type scene at least.