Maggie Gyllenhaal asks 'Why is sex fun?' for Discovery

The Gyllenhaal siblings sure like their Discovery Channel! First Jake Gyllenhaal joins Bear Grylls for "Man vs. Wild" and now Maggie Gyllenhaal hosts the third episode of the first season of "Curiosity."

In her episode, which aired Sunday, Aug. 21, Gyllenhaal hosted a revealing investigation into the latest scientific research on orgasms and sexual pleasure. The press release says, "Sexual pleasure is among the most prized, meaningful and richest experiences known to man. But the orgasm is a true scientific puzzle."

There's a clip above of Maggie's episode and if you missed its first broadcast, it re-airs on Discovery Sunday, Aug. 28 at 11 a.m. ET,  Monday, Aug. 29 at 8 p.m. ET and 11 p.m. ET and Wednesday, Aug. 31 at 3 a.m. ET.