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Jamie Dornan and Dakota Johnson show their chemistry as they pose together for a series of pictures in the March issue of Glamour magazine. In the interview, the on-screen couple talks about the steamy sex scenes in their upcoming film "Fifty Shades of Grey".

.@FiftyShades' @JamieDornan & Dakota Johnson are on our March cover. Your sexy sneak peek: https://t.co/uSeGcQgRHq pic.twitter.com/R0lXeinPEn

— Glamour (@glamourmag) January 30, 2015

"Some of the Red Room stuff was uncomfortable," said the actor who plays kinky billionaire Christian Grey. "There were times when Dakota was not wearing much, and I had to do stuff to her that I'd never choose to do to a woman."

Johnson who takes on the role of naive coed Anastasia Steele seemed to agree, "There were some painful moments. I got whiplash once from him throwing me on the bed; so f**king painful." She said, "It's stressful enough to be tied to a bed naked in a scene. But then they call cut, and you're still tied to the bed, naked. Jamie would be the first one to throw a blanket over me."

#FiftyShades fans--you need to see these pics of @JamieDornan + Dakota Johnson: https://t.co/ir87JiyOOE @fiftyshades pic.twitter.com/PqEQ2VL08E

— Glamour (@glamourmag) January 30, 2015

Director Sam Taylor-Johnson said, "We left anything that was emotionally difficult or of a sexual nature until the last few weeks of filming. By that point we had time to get to know each other, to build that trust, which was important to be able to go into the next realm. Those days on set were calm, but you could definitely feel tension."

While Dornan visited a sex dungeon to prepare for his role, Johnson turned to books for her research. "I didn't go to the sex dungeon. I wanted to keep myself distanced from it at first because I wanted Ana's reaction to certain things to be completely honest and real, like new," she explained.

"But I did do a lot of reading about the culture of BDSM," she added. "It's about the ebb and flow of control between two people. To me, there's something really honest in wanting to completely give up control for just a second."

In response to the critics who slammed her character as "weak," the actress said, "I think she's actually stronger than he is." She elaborated, "Everything she does is her choice. And if I can be an advocate for women to do what they want with their bodies and not be ashamed of what they want, then I'm all for that."

Dornan, meanwhile, said of his character, "Christian was a massive challenge. I've played a couple of sick, sick dudes, serial killers ... and characters who don't treat women the way society deems appropriate. But it's just TV, movies - it's not real."

"I've always had a deep respect for women. I have two sisters. My father spent his career as an obstetrician-gynecologist caring for women ... But you have to find something likable in every character you play. I like how driven Christian is. [Still], I don't think I would like him if he was a real dude and we met."