He said: "If we were going to be as open and intimate in a love story as we could be we have to do the same thing with sex. You can try but I wouldn't recommend it! So that was really important. We knew that if we did we would get somewhere in the audiences' unconscious that these were people who were actually in love and not just actors telling a love story. The Hollywood hunk wasn't scared about getting nude and didn't consider working out any harder at the gym for the role of pharmaceutical rep' Jamie Randall. I wanted him to be a little skinny and sinewy and slimy. Jake Gyllenhaal refuses to wear underwear when filming sex scenes.

Their attire of wool jackets, skintight blue jeans and matching denim shirts with leather boots perfectly square them in the trope of the cowboy. They spit often, talk little, and look each other in the eye even less. At first anyway. The two farmhands, their boss informs them, are going to stay up in the mountains. All they have is each other, and the first thirty minutes of the film is a quiet pastoral build to very sudden sex.

Some use stand-ins, others go for the real deal, and a few have gone so far they've almost been banned. Whatever way they're accomplished, the actors involved are bound to come away with a few stories, and boy, do they. Sex scenes are no walk in the park, and when you're dropping your clothes with a near-stranger, things are bound to get a little … uncomfortable.