Physically impossible. Sex cannot occur in space. For one, lower to no pressure means you can't get it up. No boners in space. Secondly, the act of sex should you "get it up" would be more of you lifting and thrusting her on and off your dick, which wouldn't be very fun. This is hypothetically past the point where you could actually maintain any kind of erection. Should you impregnate her, it's impossible to have a child in space without gravity, and the cosmic radiation would kill your baby very quickly.. Development requires gravity for a number of reasons (muscle development, etc.). Also, the reality of spaceships at this point in time is that there is very little space where you could do it. Every tunnel only fits one man, even on the space station. Not to mention your dick would freeze in space.
I do admit it would be fun to see her squirt her way into a blast door.
