I am fucking an escort in front of my girlfriend for her birthday

It's per her request, but I'm looking for some advice. The only rule is that I can't kiss the other girl (which from what I understand is a normal rule with escorts)

• How do I go about finding a good/clean/attractive one?
• What should I do in front of her (to entertain or get her to join in)
• How do I make sure there are no hurt feelings
• Are there any girls that have done this with their boyfriends? What happened after?
• Anything else you can think of, suggestions, feedback you have is welcome as I'm not convinced this is a great idea.