"Fifty Shades of Grey" casts Jamie Dornan and Dakota Johnson grace the cover of Glamour magazine where they shared their similar fetish.

Jamie Dornan, who plays Christian Grey, said that he prepared for his role as the masochistic billionaire by watching a session.

"One rainy Tuesday evening, I kissed my wife and baby goodnight and went to watch a dominant/submissive session in a dungeon," he said. "The dominant was our sort-of adviser on the job. So I watched him do his thing... I didn't enjoy it massively, but it was helpful to a point."

While fans might expect the "Fifty Shades of Grey" casts to share similar fetish with their on-screen counterparts, Jamie Dornan and Dakota Johnson disappoint.

"I've got a thing for great hands. My wife [Amelia Warner] has my favorite hands in the world," the actor said.

It's a fetish that Dakota Johnson shared, apparently.

"Like Jamie, I like good hands. Manly hands. I grew up in Colorado, and there are manly men there, so manliness is attractive to me," she said.

The two also shared the same trainer, although Jamie Dornan made sure to maximize his sessions because of his pregnant wife.

"I had to do a lot of work to get in shape because Christian's someone who's very anal about that. But it wasn't six hours a day," Jamie Dornan said. "You don't want to turn to your heavily pregnant wife and say, 'I'm going to the gym for six hours. Text me if you go into labor."'

For her part, Dakota Johnson said that she's going to show some skin in "Fifty Shades of Grey" so she has to work out.

"It was important to me that Ana's body look like that of an active college student. And I was going be naked, so I wanted to look good. I did a lot of working out and had more waxing than any woman should have," Dakota Johnson explained.