Mario Lopez & His Package Debut New Underwear Line Rated M [PHOTOS & VIDEO]

Extra host Mario Lopez is stripping down to his undies in a sexy campaign for his new line of underwear, Rated M.

Lopez explained, “The ‘M’ stands for masculine, modern, Mario… make it whatever you want it to be.”

PHOTOS: Kellan Lutz’s Big Green Calvin Klein Underwear Bulge

He’s partnering up with underwear retailer Fresh Pair. “Excited about my underwear line launch tomorrow! @RatedMofficial Stuff turned out awesome, high quality and super comfortable. @freshpair,” Lopez tweeted Wednesday afternoon.

We added some additional shirtless pics of Mario to the gallery as well. So enjoy those. Watch preview videos for the campaign…