Leslie Mann Gives Jason Segel a Boner in 'This Is 40' Featurette (Video)

Greg Gilman
The Wrap

Now a struggling personal trainer, Jason Segel reprises his role in Judd Apatow's sort-of-sequel to "Knocked Up" and judging by behind-the-scenes footage from "This is 40," it wasn't exactly hard work for him.

Or was it?

Also read: 'This is 40' Trailer: Paul Rudd and Leslie Mann Laugh in the Face of Domesticity (Video)

"If you were my girlfriend, I would need an anti-Viagra pill to try not to get a boner," the actor tells Leslie Mann, his director's real-life wife, while helping her get into shape. "You give me a boner."

Boner jokes aside, a new featurette focusing on Segel's relationship with Mann's character proves he may once again have one of the funniest parts of the movie.

When he's not blatantly hitting on Debbie, he's busy berating her friend Barb -- played by "Bridesmaids" co-writer Annie Mumolo -- for not being as physically fit.

"This is why you're the before picture and she's the after picture," Segel scolds.

Just one of the many jerky zingers we have to look forward to when the comedy hits theaters on Dec. 21, 2012.

Take a sneak peek:

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