If there's one way to check whether two actors have good chemistry it's how they look during an intimate scene. For Shailene Woodley and Theo James, their first intimate scene for 'Insurgent' may have been very romantic, but things were very different behind the camera.

The stars of the upcoming 'Allegiant' movie recently opened up about their intimate scenes in 'Insurgent' and it seems that they dropped a major bombshell on their behind-the-scene romance, E! News has learned.

"Sometimes booze helps if it's really hard-core," James said while talking about the experience of filming love scenes with Woodley.

James then went on that for the upcoming 'Allegiant' film, everything's very different.

"With this, it's OK, because at the end of the day it's going to be PG-13," he said.

As for Woodley, she revealed that she's very confident of her sexuality so she didn't have a hard time to let loose just to get comfortable.

"I guess I'm very European in that way," Woodley said adding, "Sexuality is a very normal part of life and the more we suppress that normalcy, I think the more we seek it in ways that don't actually fulfill our sexual needs."

Woodley then revealed that the director also helped them get through with their supposed to be pretty intimate scenes.

"The director creates a very safe environment where he's like only the keys needs to be in that room. There are only maybe four people in there with you," she said.

Shailene also gave credit to Theo for being a gentleman while they were filming the love scenes, reports Fashion & Style.

"f you're working with an actor who is a gentleman-or a gentlewoman, depending on the scene-then it's a very sort of technical experience. Theo is a gentleman...It was like we were doing any other scene, in a way," she said.

James then chimed in that he and Woodley are "now very comfortable working with each other and we trust each other and we're open with each other." 

'Allegiant' is set to commence filming in May. The movie is slated for release on March 18, 2016.

Aside from Woodley and James, 'Allegiant' also stars Ansel Elgort, Kate Winslet, Miles Teller, Naomi Watts, Maggie Q and many more.