He noticed the blue band earlier of course, but never got round to asking about it, in the light of so many other new things to ask about. He gives it a curious glance now, though, when Ianto draws his attention to it.
"So if I want to fuck, it has to be with you?" he asks, just for confirmation, because it seems sensible to know the rules. And he's not overly worried about this particular restriction right now. He's just been stuck in the same small community living the same two weeks for several years, so even getting one new person to fuck seems like a huge great adventure at this point!