Kunis was 14 years old at the time, while Kutcher was 19.

“They were like, ‘You guys are going to be making out in this scene.’

And I’m thinking wait, this is slightly illegal,” Kutcher recalled to O’Donnell.

Mila Kunis, Ashton Kutcher, & Danny Masterson during “Traffic” Los Angeles Premiere at The Academy in Beverly Hills, California, United States

Mila Kunis, Ashton Kutcher, and Danny Masterson.S Granitz/WireImage

Kunis added, “I’ve never kissed a guy.

Ashton’s attractive, and I was a 14-year-old little girl and I was extremely scared for my life.

He was very nice about it.

He was like, ‘Don’t worry about it.’

Kutcher confirmed that he and Masterson “had a little side bet going.”

He said, “You’re kissing on the show, we’re boyfriend and girlfriend.

You would use tongue.

Danny bet me like 20 bucks I wouldn’t do it.”

“I didn’t let him, but I think he tried,” she said.

Kutcher then said he believed Kunis had already turned 15 by then.

“So why are you asking people to do that?

That’s the more important question,” O’Brien said in response.

“I mean, you got ‘em, you know what I mean?

Everybody should grab,” Masterson replied.

O’Brien said, “I’ve heard about you.

And you’ll be caught soon, I know you will.”

“I will,” Masterson confirmed.

We would never want to do that.”

Reps for Kutcher and Kunis didn’t respond to EW’s request for comment on the resurfaced O’Donnell interview.