TOP 10 REASONS WHY SEX AT THE SPEED OF LIGHT IS NOT AN ADVISABLE FORM OF PROCREATION
Be forwarned!
Actually, from the man’s point of view, provided the woman’s moving with him, the woman will be ageing at the same rate as he is. From an observer’s point of view however, time will be going very very slowly, and the observer will wonder if this is a new form of tantric sex. 
Pfft.
It’s all subjective.
Actually, a similar argument holds for nearly the entire list, I think.
Presuming she’s not a relative.
Relativistic flaming semen
Gotta say it: Bandname!
…Upon ejaculation, releasing billions and billions of sperm…
11. Blue-shifted balls.
There once was a sailor named Fisk
Whose stroke was excessively brisk
So quick was the action
That the Lorentz contraction
Diminished his dong to a disk.
I thought only Hillbillys had relativistic sex.
Now this is probably the result of relativistic sex. Yes, it is a galaxy.
