oh you dirty girls! ;-D
I bet it's totally different though, when a group of guy friends get together to watch a movie with naked chicks, than it is from a bunch of chicks checking out packages in a movie. I can see it now, the girls are squealing, laughing, joking around with each other, cat-whistling, while in the other room with the guys, they're all just staring with their mouths gaped open. Ha ha
Honestly, and this may sound a little weird, I try to avoid movies with any nudity. It's probably, no, definitely my religion background, but that's how it is. Now I have seen some really great movies with male nudity, which I personally am disgusted by, cuz I'm straight, but here ya go:
Forgetting Sarah Marshall
Hall Pass (I actually didn't like it, but damn that guy's got a huge package. A guy can't help but be jealous)
Into The Wild
The Hangover
Wild Things (1998, I think you girls would love this one)
And here, you can explore these lists:
http://www.imdb.com/keyword/male-frontal-nudity/?title_type=feature&min_votes=1000
http://www.imdb.com/keyword/male-full-frontal-nudity/?title_type=feature&min_votes=1000
You might also enjoy these, as they have either a gratuitous amount of male frontal nudity, or a scene with hardcore male nudity.
The Brown Bunny (no joke, a guy gets a real BJ in this movie) http://www.imdb.com/title/tt0330099/?ref_=fn_al_tt_1
Quills (drama, and there's tons of sex in this movie, and tons of nudity) http://www.imdb.com/title/tt0180073/?ref_=fn_al_tt_1
Shortbus (same as Quills, only it's a comedy) http://www.imdb.com/title/tt0367027/?ref_=fn_al_tt_1
Kinsey http://www.imdb.com/title/tt0362269/?ref_=fn_al_tt_1
Sideways http://www.imdb.com/title/tt0375063/?ref_=fn_al_tt_1
The Dreamers http://www.imdb.com/title/tt0309987/?ref_=fn_al_tt_1