I'm glad you inserted the rider
It does have dangers though....
I may be too jaded and cynical for my own good, but the scene you described above seemed to remind me of one thing: the scene from the film
The Accused.
I'm not au fait with pool hall ettiquette, but I'd have made that rider something like:
There are lots and lots of dangers - so consider looking elsewhere to fulfill your gangbang fantasy
Just 2cents worth.