Can't say I haven't done it. I guess it all just depends on your comfort level with the girl. I will say that several of my regulars scrub up after every customer. By "scrub up" I mean...they rigorously sterilize their money maker.
It's a personal choice and I say use your best judgement, but some guys think it's absolutely filthy. That's totally fine, but I can't remember the last time one of my provider's pussy stank? On the contrary, I've been with a few non-pro's where I've gone down, and came right back up.
Perception isn't always reality.
Bmalibu