Nearly all providers, as far as I know, note that there is no BBFS and, sometimes, no SS or similar activities that might lead to a BB incident. However, I have been with several providers that despite those same "warnings" in their advertisements or showcases, oops, allowed or even made clear "in the heat of the moment" that BB was okay or wanted, despite the fact that the condoms were sitting next to the bed within easy reach.
It always made me curious. Were they using female condoms? Was it just a 1 in a 1,000 occurrence? No judgement by me on this topic but I wonder if it happens more than I might imagine?