I have done extensive research and I will tell you that 99% of the time PSE != bbfs. You need to check out the providers website faq and some of them it does mean bbfs.

99% of ladies who say they offer pse really meaning bbfs is grossly overinflated.

I've been told 1/2 of actual porn stars will give bbfs with recent papers (meh) which is probably about the same percentage as non-pornstar providers that offer pse (meh).

But yes check a provider's site to see what pse means for her if she even gives such a definition.... also checking urbandictionary wouldn't hurt.

Personal opinion pse and bbfs do not or rather are not supposed to mean the same thing. BBFS means bbfs (bare / uncovered vaginal sex).