Blake Lively
, Taylor Kitsch and Aaron Johnson may look pretty cozy in their "Savages" sex scenes -- but when it came time to film the graphic deeds on set, it was nothing short of awkward.

The three are intertwined in a love triangle in Oliver Stone's new drug flick, a love triangle that meant both boys had to get naked for separate sex scenes with Blake ... and get intimate together for a sizzling menage a trois.

"It was definitely really challenging because, you're on a set with 40 people and the boys are standing there naked," Blake tells toofab about the mood behind the scenes. "That's always a little awkward."

"A lot of sexual improv was going on there," Kitsch jokes, before also saying the risque material was "very awkward to do."

The main reason it was so odd: He was stripping down with a costar he barely knew.

"I knew Blake I think 3 days, 4 days really. That was the first week of shooting," says Kitsch. "I was just glad it was over with, to be honest. It's a pretty intense reveal, no pun intended. It's all part of it and I was glad it was in the first week."

You can see the trio get down and dirty when "Savages" opens July 6.

Check out some sneak peek pics above and the trailer below:

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