adam1pic460.jpgCourtesy: Cosmopolitan UK

Adam Levine is showing off his gorgeous rock star body in the February issue of Cosmopolitan UK ... and it's all in the name of cancer awareness.

The Maroon 5 singer is hoping to inspire guys to get checked out for early signs of prostate and testicular cancer. Let's just say this sexy spread is for both the men and the ladies!

As for the disease, Levine says:

    "I spend most of my life naked. 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?"

Way to turn up the heat, Adam!

See even more of the rocker's ripped body after the jump ...