Olivia Wilde and Jason SudeikisChristopher Polk/Getty

Jason Sudeikis and Olivia Wilde make no secret of their hot-and-heavy romance.

Last October during "These Girls, an evening of monologues hosted by Glamour, Wilde revealed that she and her fiance "have sex like Kenyan marathon runners" -- a description Sudeikis has now confirmed as "accurate."

Chiming in on their bedroom antics in the August 2013 issue of ELLE, the "Horrible Bosses" star attributes his newly svelte physique to more than a few proverbial rolls in the hay.

"I have the greatest workout partner in the world -- and you don't need a gym membership for that kind of workout," he says, wink-wink, nudge-nudge.

"A lot of it comes from tiny things," he adds. "Like not eating barbecue sauce with my pizza at two in the morning. I think it's all a manifestation of being happy and wanting to treat myself well."

Sudeikis and Wilde announced their engagement in January 2013, and they're eyeing a spring 2014 wedding.

[via ELLE h/t Us Weekly]
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