If Gwyneth Paltrow, aka the Most Beautiful Woman in the world, is parading around in front of you in lingerie, and you don't do anything about it -- well, props to you, friend.

That's just what Mark Ruffalo does (or should we say, doesn't do) in "Thanks for Sharing." As seen in the dramedy's first trailer, Ruffalo plays a sex addict who falls for Paltrow. But their romance hits a bump when she finds out his secret.

"Isn't that something guys just say when they get caught cheating?" she asks incredulously.

Ruffalo's character, Adam, is five years sober, but still struggling. So are fellow group members played by Josh Gad and Alecia Moore (aka Pink). Gad gets caught filming up his supervisor's skirt and has to stop taking the subway to avoid temptation.

"How can you be a sex addict?" his grandmother wonders. "You don't even have sex."

Tim Robbins, Joely Richardson, and Patrick Fugit also appear in the movie, which is the directorial debut of "The Kids Are All Right" writer Stuart Blumberg.

"Thanks for Sharing" hits theaters September 20.

Thanks for Sharing - Trailer No.1
Watch Our TIFF Movie Review of Gwyneth Paltrow's Thanks For Sharing