Aliens came to earth and shared technology with us. One piece of this technology was a teleport system. There were teleport stations set up in every town. People were eventually keen on using them.
Eventually it was learned that there was a delay in the time it took to teleport and it was discovered that all the females were being made sterile. This was the alien's way of conquering the earth and wiping us all out.
I know the series is not "V".