David Paisley and Jonathan Keane in Unhappy Birthday (2010)

In this movie, David Paisley and Jonathan Keane have a gay relationship. We see them having sex in a scene where we view Jonathan Keane's butt and briefly David Paisley big uncut dick. In that scene David Paisley is the bottom of the sexual act. Later in the movie, they are taking a shower together and we see both of them naked, front and back. They both have big uncut dicks, especially David Paisley.

Federico Pitzalis in Devil in the Flesh (1986)

80 minutes in the movie, after several sex scenes but no male frontal nudity, there is finally full frontal nudity from Federico Pitzalis. The girl starts licking his penis, and as it is getting bigger, she sucks on it. We can see his penis getting bigger by the minute, and his tight foreskin pressuring his throbbing head.

James McAvoy in The Last King of Scotland (2006)

Right at the beginning of the movie, we see James McAvoy in his wet underwear, with a clear bulge.
There are several other bulge scenes later on also.
50 minutes in the movie, James McAvoy only wearing a short undresses in front of the camera. He is slightly remote, so we don't see a lot of details.
We can however see that James McAvoy has a great bubble butt and a rather large uncut penis.
We see again his butt when he is making love to a woman, 74 minutes through the movie.

Sam Rockwell in Lawn Dogs (1997)

At the beginning of the movie, Sam Rockwell strips naked and jumps from a bridge in a river. As he does that, we can see his butt and his dick. He is cut. After his swim, he gets back to his truck naked and we can see him again with a full frontal. Later in the movie, he is having sex with a girl and we can see his butt. His butt looks like a peach with a thin layer of hair.

Joe Gosling in Dream On (2013)

Joe Gosling is getting naked 13 minutes in the movie to go swim. We see his butt and also his uncut dick and balls, hanging in between his legs.

Ulysse Grosjean in Heat Wave (2011)

45 minutes in the movie, Ulysse Grosjean is taking a shower. Fortunately for us, the camera films everything, including his big thick uncut dick. It is filmed sideways, so we get to see both his dick and his butt.

Taylor Reed and Joe Swanberg in Blackmail Boys (2010)

Right from the very beginning of the movie, we see Taylor Reed playing gay web cam. We see Taylor Reed jerking his big cut dick on the computer screen.
15 minutes in the movie, Taylor Reed is making love. In very close-up, we see Taylor Reed big cut dick in great details. Then we see Taylor Reed's butt for the first time. Taylor has a hairy crack.