The first celebrity that comes to mind is Warren Cuccurullo, a rock guitarist for Frank Zappa, Missing Persons, and Duran Duran.
He really put his SEX out there, posing for G Magazine (December 2000) and, subsequently, hosting his own website with adult oriented pictures, videos and webcam performances. His stuff wasn't leaked like so many other celebrities .. he put it out there for everyone to see. No shame. That kind of confidence is sexy in itself.
Even though he was in his mid-40's when his nudes first hit the newstand, he put the younger rockers to shame with his fat-free body and huge cock. What I would give to have seen him naked in his 20's or even 30's...
If you haven't yet shared in the WCC "Warren Cuccurullo Cock" Experience, you can see some great pics here:
The Best Gay Gallery: Warren Cuccurullo
Download his solo j/o video here:
Deposit Files
And check out some of the former LPSG postings here:
http://www.lpsg.org/search.php?searchid=10387083