Awkward moment? More like amazing! In the new red-band trailer for romantic (and bromantic) comedy, That Awkward Moment, Zac Efron gets completely naked -- baring his toned backside as he sprawls on a toilet after he and his male pals (Michael B. Jordan and Miles Teller) suffer the side effects of "boner pills" (i.e. Viagra).

On the mend from a rehab stay earlier this year, Efron, 25, looked healthy and hunky as ever talking up That Awkward Moment (out next January) at Q&A event in Culver City, Calif. on Tuesday, Oct. 14.

"The movie was about girls and friends and relationships and was showing kind of how our lives are so I think we knew a lot about it and I think we had almost too much fun," Efron told the crowd. It was great."

In the film -- the first from Efron's production company -- buddies Efron, Teller and Jordan all vow to stay single after Jordan's character suffers a bad breakup, with Efron falling unexpectedly hard for one young woman.

What kind of girl is Efron looking for in real life? "Someone kind of creative and smart and self confident. And feet! And a nice smile," he said. As for romantic advice? "My family's great - more and more I come to rely on my little brother to keep me grounded, he's 21 now!"

Watch the trailer now!