Credit: Ben Riggot courtesy of Cosmopolitan UK

Hands All Over, indeed!

Maroon 5 frontman Adam Levine is taking it all off for Cosmopolitan UK -- but the sexy shoot is more than just an excuse to show off his rockin' bod.

With a strategically placed hand covering his genitals, the 31-year-old singer doffed his clothes to encourage men to check for signs and symptoms of prostate and testicular cancer.

"I spend most of my life naked," Levine says. "In fact, I often have to be told by the people around me that it's inappropriate to be as naked as I am. But I live in California, where it's always warm, so why not?"

The rocker, who's currently dating Victoria's Secret model Anne Vyalitsyna, also shares his biggest turn-ons with the mag's February issue.

"On a woman, I think lingerie is beautiful and amazing," he says. "But you only enjoy lingerie once it's off, so let's just cut to the chase.'