Goes without saying. You gotta ask within the first few seconds even if you don't think so. Then respectfully decline if it turns out to be a ktoy. Trust me... on occasion, you really can't tell (unless you've been here a few times)! Forget about the respectful part, and you can end up with a severe beating.
If you're down with paying for it, it costs a bit more but you know what you're getting at/with the devil's den.
Just broke my personal record for number of consecutive days without dying!