Peter Parker in any incarnation. But I understand that his costume was the most bulgeworthy since Burt Ward's tights on the old Batman tv series (scroll down to see it).
He's also displayed his very tight, hard physique elsewhere, in Pippin (both on Broadway and at the A.R.T. in Boston), Fame, Romeo and Juliet, and Dorian Gray, a musical version of the gay-subtext Oscar Wilde classic.
Billy Elliott (as a gay kid that Billy beats up) and About a Boy.
And on tv in Bad Girls, Trevor's World of Sports, Doctors, Genie in the House, and Midsomer Murders.
He starred in the Fame clone Brittania High (2008) as Jez, a rich kid who befriends street dancer BB, with the gay subtexts usual in such teen soaps.
Ok, ready for the Spider-Man costume?
Of course, the other two guys who played Spider-Man, Matt Caplan and Reeve Carney (below), are equally bulgeworthy. Maybe it'st the costumes.