Ewan McGreggor has worked with two Doctors: Christopher Eccleston in Shallow Graves (1994) and Peter Capaldi in Solid Gemoetry (2002). Eccleston played the Ninth Doctor on Doctor Who (2005-) in its first season and Capaldi played the Twelfth Doctor on Doctor Who (2005-) in season 8-10.
Ruth Millar said making the sex scenes with Ewan McGregor look authentic was difficult. "It was a worry beforehand. You can't help but feel tense about something like that. We rehearsed it and rehearsed it before we shot it because we knew on film it had to be quite erotic. But when we were actually doing it, there was too much humour going on to take it remotely seriously. You're clashing teeth, you're laughing. It's fun, it's embarrassing, it's awkward and the only way to get through it, is to get on with it. By the end of it, I found it quite liberating. I don't feel quite so bothered about being naked as I used to," she said.