Dave Franco appeared on Chelsea Lately Thursday, May 8, and dished the details on his first-ever sex scene.

Dave Franco got freaky in his Neighbors role, but the actual filming of it was super awkward. James Franco's younger brother appeared on Chelsea Lately Thursday, May 8, and dished the details on his first-ever sex scene.

"It was my first real sex scene where I show my butt," the 28-year-old actor told Chelsea Handler. The crowd roared in response, but Franco said it's not what it seems. "You're not going to have that reaction when you see it on the big screen," the star continued. "It was nerve-wracking."

"I was pretty nervous. I met the girl the day before, and she was beautiful and very sweet," he said of his costar Halston Sage. "But it's awkward. You meet each other and then you're grinding. You don't even know her name… barely."

The 21 Jump Street star explained, "You have 20 crew members who are also watching you do it, and of course, for me, I woke up that morning and had a giant pimple on my ass!" So how did Franco resolve it?

"I had to go to the makeup artist, who I had also met that week," the star said, recalling that he asked, "'Can we go into the other room and you'll put makeup—literally—on my ass, and uh...?'"

The embarrassment didn't stop there. His sex scene in the movie is interrupted by Jerrod Carmichael's character. "He has this view of me that no one should have," Franco continued. "He essentially had a staring contest with my brown eye and lost."