Taylor Kitsch, who is used to merely battling aliens in his movies, had only known costar Blake Lively a few days before they got 'savage' between the sheets

Taylor Kitsch, 31, has built up a reputation for fighting aliens in this year's John Carter and Battleship, but that all seems like a walk in the park next to shooting love scenes with Blake Lively, 24, his leading lady in the new Oliver Stone flick, Savages, also starring Aaron Johnson, John Travolta, Salma Hayek, Benicio Del Toro and Emile Hirsch.

"It's very awkward to do, you know, and I was just glad it was over with, to be honest," said Kitsch about his sex scenes with Lively, reports People. "And it's such a big part of [my character] and who he is, and that's how you meet him. So it's a pretty intense reveal, no pun intended."

Lively, who has been dating the ex-hubby of Scarlett Johansson, Ryan Reynolds, since October 2011 after they starred together in The Green Lantern, had barely met Kitsch before the two got "savage" between the sheets for filming. "A lot of sexual improv was going on there," said Kitsch. "God knows we had two weeks of rehearsal, so we talked until we were about to pass out, and then [we shot the sex scenes] on the day I think I knew Blake three days … four days maybe."

Savages hits theaters on July 6, 2012.

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