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Judd Apatow has fulfilled his promise to "shake Americans from their squeamishness about male anatomy in movies" by featuring Forgetting Sarah Marshall star Jason Segel completely nude in the movie's pivotal break-up scene. And as the LAT pointed out yesterday, Segel's manhood provides the film's "most captivating screen presence" (sorry, Kristen Bell). But Apatow and his cool comedy clique aren't the first ones to boldly focus their cinematic lens on male actors' full frontal displays. We took a look back on Segel's predecessors to showcase other (pun intended) ballsy big-screen cameos by the likes of Bruce Willis and Ewan McGregor after the jump. Just a warning, this is NSFW.

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Back in 1994 when Bruce Willis was still with Demi and still managed to maintain that sexy tough guy image, he revealed the full monty in Color Of Night. And the industry's most dedicated fan of showing off his package, Ewan McGregor, memorably lounged naked throughout several scenes in Young Adam. And we all remember the time from a chiseled Kevin Bacon subtly proved to the world how lucky Kyra Sedgwick is via steamy shower scene in Wild Things.

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Before Ewan McGregor, Harvey Keitel was Hollywood's go-to full-frontal actor, stripping down for both Bad Lieutenant and The Piano. But our all-time favorite appearance by a male actor's schlong has to go to Mark Wahlberg in Boogie Nights. Yes, it was a hefty prosthetic, and no, we don't learn just how much junk Marky Mark is packing, but the highly anticipated revelation of Dirk Diggler's legendary package was worth waiting two porn-y hours for back in 1997.

[Photo credits: Entertainment Weekly, Celebritycandids.com, nudemalestars.com, Maxim, malecelebrities.biz]