We knew we could rely on Jennifer Lawrence to tell us what filming a movie sex scene is really like, as the Hollywood actress explains it's no fun when the guy is married.

Chatting to the Hollywood Reporter about having fake sexy time with Chris Pratt in their new movie Passengers, J-Law admits that to prepare she got "really, really drunk."

Only that meantmore anxiety, which to led her asking herself, "What have I done? I don't know."

Oh and it didn't help that she knew he was a happily married man.

"He was married. And it was going to be my first time kissing a married man, and guilt is the worst feeling in your stomach. And I knew it was my job, but I couldn't tell my stomach that. So I called my mom, and I was like, "Will you just tell me it's OK?" She said.

Adding: "It was just very vulnerable. And you don't know what's too much. You want to do it real, you want everything to be real, but then... That was the most vulnerable I've ever been. It was weird. And everything was done right; nobody did anything wrong. It's just a bizarre experience."​

So the moral of the story is this: Even if he's really hot, it still feels weird to make out with a married guy.

- By Lucy Bacon