Jason SegelSteve Granitz/WireImage

No, not that kind of sex tape.

Jason Segel says his newly svelte physique is all thanks to his role in the upcoming movie "Sex Tape."

"I've just been living healthy, exercising, eating right -- no more midnight pizzas," the 33-year-old actor told Us Weekly at a Summer TCA Party in L.A. on July 30. "This time when I take my shirt off, I've made a promise to myself, it doesn't have to be funny."

As it was when he went full-frontal for the 2008 comedy "Forgetting Sarah Marshall," which he wrote.

Segel will reteam with "Bad Teacher" co-star Cameron Diaz for "Sex Tape," about a husband and wife who decide to mix things up by bringing the camera into the bedroom, only to have their triple-X footage vanish.

"It is R-rated," Segel added, "and I'm not in shape for no reason."

"Bad Teacher" director Jake Kasdan is helming the comedy, which Rob Corddry is in talks to join. Corddry would play the couple's friend who helps them recover their missing tape. Jack Black is set to make a cameo as a porn company exec.

Filming will likely begin this fall, targeting a 2014 release date.

[via Us Weekly]
HuffPost Fun Reel: Jason Segel, Jeff Garlin

Sex Tape Movie Poster
Sex Tape
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When Annie (Cameron Diaz) and Jay (Jason Segel) first meet, they have an instant and intense romantic... Read More

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