I used to work in the (fetish) sex industry and so I know or knew a few models who later became well known on the web. I have to agree with Wraith in that most people like to keep their modeling/sex industry work and the rest of their lives separate and I know a couple of ladies who have retired and are now doing respectable jobs and would most definitely
not appreciate someone bounding up to them and saying, hey, I love your pix, however well meant.
As it happens I have a respectable job myself these days and there are even a few pictures of me spanking a cute girl out there somewhere which might get me into trouble one day. Mind you if a pretty girl ever recognised me and came up to me and asked for a spanking I guess I wouldn't mind that much... there are exceptions to every rule!
Needless to say this never has actually happened.