Dakota Johnson reveals the crazy reality of shooting the sex scenes in 'Fifty Shades'

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"Most of [our preparation] is just really figuring out exactly how were are going to accomplish the scene beforehand—so that there's not a lot of waiting around while we're both vulnerable.

"But, if something is very, very difficult, it's sometimes necessary to have a shot of something strong beforehand.”

"Jamie mostly had an advisor that was on set for the first film, not so much for the second. Then we just had people who specialized in knowing how things work, like how to use certain tools and toys.

"There's a certain method. It's very intricate and the details are really important. The rules are also really important. We didn't want to go make a movie about something we didn't research to the bone.

"So to really honor the BDSM community and we did it the right way."

"The most difficult one by far—I think in all three movies—was a sex scene in the third film where I was handcuffed with my arms and legs to the gate.

"It's like a fence thing that comes down. And I was blindfolded. And it was kind of shocking

because I didn't realize that no matter how prepared or rehearsed I was, when your senses are taken away like that, you can't control the way your nervous system will react.

"So it was really tricky to navigate that scene. It was kind of difficult."

"Oh yeah, Jamie's little pouch. It's super not glamorous—it's really unsexy. He wore that, and I had these sort of strapless thongs that had glue on them. It's not glue, but it's sticky.

"They're, like, basically if it were a nipple pastie, but underwear. But it's only sticky at the top, it's not sticky the whole way. It would also come off because the adhesive would wear out, so then they would superglue it to my body so that it wouldn't fall off. And I would wear two of them.

"It's not painful, I mean, it's barely anything. But I guess you have some sense of being covered. It's f*cking bizarre."