I don't think the problem is Ben wanting to have casual sex, I think the real problem and why I personally dislike Bryan's route is that Ben DOESN'T want that. This route makes you feel bad because you know that in the end Ben just wants to be with Bryan in a closed relationship and is willing to do everything he does just for the chance that he will change his mind, he's betraying himself trying to be like Bryan. In my opinion I think that Bryan's route should never even give you the option to be with him, something like Leo's route from Echo, he is not good for Ben and I think that either being alone or with Kane would make such a better option for him, being with him is the actual bad ending.