I don't know if it counts, but the scene where the chick jacks Vince Vaughn off at the dinner table in The Wedding Crashers. I was so flushed, and turned on after watching that scene. Especially when he came.
You mean this?
YouTube - Wedding Crashers Dinner
Cote de Azur is a French film about a straight guy who jerks off in the shower. His father thinks he's gay and in love with his gay friend who is staying with them The gay friend also jerks off in the shower. Later the father who say the gay guy jerking off, also jerks off in the shower. Several other partial or implied jerk offs as well.
Phillip Seymour Hoffmann in the movie "Happiness"
It is quite graphic.