I've done sexual stuff before - onstage, which is even more emotionally difficult. With a TV crew around, you are stopping and starting; it becomes really technical. It's not erotic at all.
People are strange, but more than that, they're good. They're good first, then strange.
It's funny, like 15 years ago when I was a kid doing all the John Hughes movies, I remember Bruce Willis was the only guy who was transitioning from television into film.