Female nudity in films is quite common, however full-frontal male nudity is much more rare.

However, it does happen. Here's six well-known actors who eh... well.

6. COLIN FARRELL in A HOME AT THE END OF THE WORLD

Unless you count that sextape that got out of Colin Farrell, this is the only time we're aware of that Castleknock's own showed everyone what his length looks like. As Farrell himself said, it's nobody's business. "Who gives a f*ck? Apart from the readers of The Advocate maybe, who wants to see Colin Farrell's cock that much? And let me tell you, it ain't nothing to f*ckin' write home about. Someone told me that someone said it was fine but it was no Ewan McGregor." Is Obi-Wan Kenobi packing another lightsaber under the robes?

5. BEN AFFLECK in GONE GIRL

Although most of remember that scene with Rosamund Pike slitting Barney Stinson's throat mid-thrust, there's also another infamous scene in which you can just about see Batfleck's caped crusader. There were some who believed that he was wearing one of those infamous skin pouches, but Affleck say that wasn't the case. "The penis is in there! It's IMAX penis! You've gotta pay fifteen bucks to see it in 3-D... It's better in 3-D. You should know it was very cold."

4. MARK WAHLBERG in BOOGIE NIGHTS

First off, no. That's not actually Mark Wahlberg's dick at the end of Boogie Nights. That would be insane. As Wahlberg explains it, a number of prosthetic dongs were made to the estimated measurements of John Holmes, the famous '70s porn star. "This thing was down past my knee. And, literally, it was pretty flaccid — you'd sit down, the thing would bounce up. So the first one didn't work, it wasn't good, I had to go out to the set and show everybody... then they had to kind of modify it a little bit, and it was pretty embarrassing. And you have this weird guy putting it on you, you have to wear it all day, there's no way to go to the bathroom or anything like that, so it was pretty weird. But it's actually the only prop I've ever kept from a movie."

3. JASON BIGGS in AMERICAN PIE: REUNION

If he's not shoving into warm apple pie or getting it covered in glue or... well, we stopped watching American Pie after the second one. However, for the so-called Reunion film, Jason Biggs, better known as Jim or Cool / Hip Jim, bared all. What's more, he wanted people to KNOW it was him. "That was me. That was all me. It’s funny, I guess I understand because there’s all kinds of movie magic, but we made sure that there’s a close up shot — and then we go to a wide shot. So that my face is in it with the penis. You see a full shot so that it’s clear, or more obvious, that it’s my penis."

2. MICHAEL FASSBENDER in SHAME

One of the many reasons why Steve McQueen's haunting drama Shame received an NC-17 rating was down to Michael Fassbender's penis. Since then, the Kerryman's own Carrantuohill has been the subject of much praise by his fellow actors. Charlize Theron, in fact, made note of Fassbender's size in an awards' acceptance speech, saying it was "a revelation" and that she's "available to work with it any time." George Clooney, during his 2012 Golden Globes acceptance speech, remarked that Fassbender could "play golf with his hands behind his back with that thing." When you've got George Clooney and Charlize Theron praising your dong, you've officially made it.

1. VIGGO MORTENSEN in EASTERN PROMISES

David Cronenberg's stylish London-set crime thriller was known for some genuinely uncomfortable moments and brutal violence throughout. One scene, in particular, saw Viggo Mortensen's Russian mobster fighting off would-be assassins. Whilst completely bollock naked. "It was slippery, painful, embarrassing," said Mortensen in a 2007 interview. "You see what you see. I always knew the scene should be as realistic as the rest of the movie, so I couldn't feasibly keep the towel on. Plus, we shouldn't be trying to hide things or pretty it up in any way. I knew at times it would be awkward and vulnerable. It would also be painful because I couldn't wear any pads to protect me. All I was wearing was a bunch of tattoos."