[Ambiance]

I actually disagree with each of these; why can't he move in with one of his guy-friends to save money? It's not about trust, it comes down to the fact that it's innappropriate and lots of situations involving any of the three of you being uncomfortable could arise, and it's hard to imagine why it would be worth that. It would make a little more sense if he or she had been casually living with different roommates for a while, but it doesn't sound like that's the case.