A channel through the cervix allows sperm to enter and menstrual blood to exit.

The bill would only allow sperm to be taken from a man who had given permission, in writing, before he died.

So while the moss plants could be kept moist, there was no water allowing sperm to travel between plants.

New techniques have allowed sperm to be collected from dead men and a 63-year-old woman to give birth.

A doctor cuts and seals off the two tubes that allow sperm to travel from the testicles to the outside world.

Cervical mucus becomes clear and stretchy during the fertile window, to allow sperm to survive in and travel through it.

We will not sit idly by and allow American sperm to go to waste like so much chaff in the wind.