In a review, a guy said he only did "FPSB" with a provider. What does that stand for?

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You could message the guy and ask.

I have been reading more and more very sloppy reviews recently. I wish guys would proofread them before submitting.

But it's kind of hard to figure out what it has to do with sexual activity.

The writer is probably confused or misunderstanding a related term. FP is favorite person. FPSB financial planning standards board. Favorite Sexy Accountant!

So, FPS is First Person Shooter? Lol. You know what might help? The OP posting the review so we can see context.

link the review?
It is on TER, right?
And let us take a look.

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....he was probably into older, more experienced gals.