Caitriona Balfe Shares The Secret Behind Those Steamy ‘Outlander’ Sex Scenes. Caitriona Balfe and Sam Heughan as Jamie. What goes on behind-the-scenes in Outlander's steamiest sex scenes. The show might be known to get a little steamy, but filming those kinds of scenes are anything but, right? Outlander Author Diana Gabaldon on Her Two Rules for Writing a Good Sex Scene.