Doctor Who starts up again this week. I'm looking forward to more time travelling, planet hopping adventures.

How would time travel work in a sex scene? Imagine... you start out kissing in the current time. Next thing you're back in the days of cave people and you're being dragged off by your hair. As if that weren't enough, you escape with most of your scalp still attached only to be shot into the far future where everyone lives in a glass house, a sterile environment. Making love is out of the question. Touching another person is considered far too icky, germy and gross.