Check out 'Bronson' with Tom Hardy.
goodbye lenin had a dude getting out of a tanning bed and visible penis. I remember cause my gf at the time told me afterwards how surprised she was at how much bigger i looked compared to the guy in the movie hehehe
There is a previous thread here....movies that show penises or hard penises. Some are listed there. I remember contributing to the thread.
"Hall Pass" with Owen Wilson and Thaddeus RahmingOMG, Watch where you clap that Clapperboard: Full Film Frontals [!! omg blog !!]
Holy shit, what movie is that at 0:46?