most likely, yes.
also I just realized I missed something about your original comment, Logan remains a werewolf even after being giving wolves bane. same for Bernard. it just helps keep them in Bareshade and not go to the forest. so unless you mean you want both Logan and Bernard in your dungeon, it's prolly better to just give the wolves bane to the person you chose.
also if you are going for them both in the dungeon, having sex with them will eventually have a consequence. it's not in game yet, but the game warns us that it will happen in the future.
something funny though, you have no need to worry about actually curing them as right now there is no way to get Logan and Bernard back to being purely human. just to have better control over themselves.