A couple of thoughts to also consider.

You would like to see her have sex with a guy, just being in the room. Perhaps you are thinking you would also like to participate. If you are wanting her to do this and you unable to participate. Look up cuckhold as your fetish.

If you are considering having her do this, are you wanting to also have sex with someone? You should ask yourself, what happens when things begin to really happen, and you begin to have second thoughts. What is it you would do, and would she stop if you asked her to?

Good luck in fufilling a fantasy!

V/R
ID