As for sex appeal and suckability, he's a handsome, tatted, dark-haired, California boy from a nice Jewish family, and he's appeared naked (for testicular cancer awareness) in a Cosmopolitan UK magazine centerfold.
Sadly, despite the rumors, he's apparently straight, currently dating a Victoria Secret model. However, he's OK with the gay question and the attention: "There's no way to hide my straightness," he is quoted to have said in an Out Magazine interview. "But if people didn't think there was a small chance I was gay, then I wouldn't be doing my job very well. Look at the best ones, guys whose sexuality was always questioned. Bowie. Jagger. Freddie Mercury. I wouldn't be the frontman of a band if that question hadn't come up at some point."
And Adam is an ardent supporter of LGBT issues and civil rights. (His brother is openly gay.)
So, who else would pay money to see him get it on with Carson Daly?