Did it happen to you?

I prefer to keep it moving.

would be pretty slim considering how big all the hotels and casinos are in LV.  BUT, if I did happen to see the girl I just fucked two hours ago at the bar, I'd just smile and say hi to her, and if she was REALLY good, I might see if I could schedule another session when she got finished up with what she was doing.

Hey the OP said it had been two hours - yea I could do that!!

The goal on both ends is to be as discreet as possible.  Personally, I would have two separate meeting spots designated to lessen the chances of this happening.

Though it may be unsettling, it is the nature of the beast.  I was surprised once to see a hobbyist I met with earlier in the day to be out to dinner with his wife at the same restaurant where I was dining with another hobbyist.  He had secured another room for our meeting while his wife was out shopping and at the spa.  Perhaps a bit strange, but a sly smile from each of us made the situation more comfortable.  We exchanged emails laughing about it later...