I probably wouldn't tell them the honest truth, just because I would hate for them to feel bad about what they are doing, and that I'm judging them in some sort of way But I'm weird like that.

I would say that I have friends in the area that I haven't seen in ages and we have plans to catch up with them, and they offered us a spot there for the night. I'm usually an honest person, but I dunno... I'd hate to offend people about stuff they do in their own home ya know?