I've gotten gross massages at parlors, and on people's tables, and absolute badass ones on hotel room beds. Ever have someone join ya in on a shower? I once got in and had someone say, "Hey, wait for me!" and got a rubdown in the shower. Reverse is also true. So look for pizza out in open, stanky animals, dog/cat hairs everywhere, condoms in the bathroom trashcan, TV set on, horrible lighting/environment/music, oh my I could go on forever with annoying things I'm sure we have all seen, lol. Though usually the first hints to call it off start coming your way before you even get there... like in text messages when you ask questions and look at reviews on this forum.