I couldn't find the thread, but someone asked about football movies and I couldn't believe that on this site, nobody mentioned "Any Given Sunday." there's more dick in that movie than you can shake a stick at... great locker room scenes.
It got me thinking about full frontal male nudity in movies in general... Here's a list starter... please add your favorites.
Any Given Sunday (great locker room scenes)
Forgetting Sarah Marshall (I was amazed at the almost 10 minutes in the beginning of that movie with the main guy (don't know his name) slinging his dick around... nice!
HBO Series "Oz" (great dick in that series if you can stand the violence)
Watchmen (big blue animated dick)
Caligula (Penthouse version... really a great and disturbing porn film)
Boogie Nights (it's a fake)
Please add your favorites.