Quite a few. The first was this older lady I worked with at a health food restaurant who did a bunch in the 70s.

I've seen a few coworkers OFs.

One guy I worked with at mom & pop college diner, very early 20s, just started college and started doing amateur gay porn. He was a boyish and reasonably attractive guy. Summer break hits, he goes back home and gets a job in construction, when he comes back for school now he's ripped. So he starts working out, gets swoll, and went from being boyish to very handsome. Then he must have been seen by the right people, starts landing professional shoots. Next thing you know, he's dropped out of school and is flying all over the world being a pro performer and a well paid boy toy. He'd stop in a few times a year to say hi and was always smiling and dressed in expensive clothes.

In my younger years I ran with a pretty rough crowd, most of the girls had stripped and/or prostituted at some point. Plus we were all a bunch of freaks anyway, so I've seen a lot of my girly friends naked, either on stage or in person.