Now here's a premise for a sciFi movie. Better get to work on my treatment and story boards.
Shaitan Apistos writes "British scientists have discovered a way to turn female bone marrow into sperm, allowing women to reproduce without the need of male companionship. All children born of this method would be female, due the lack Y chromosomes, and there is high chance of birth defects. Eggs also can be created from male bone marrow, but men looking to reproduce would still need to find a surrogate mother to handle the gestation period. I'd like to take a moment to welcome our new amazonian overlords and remind them that men are still very good at mowing lawns and fixing cars." [From Sperm Made From Female Bone Marrow, Men Obsolete?]
"Adventures in the Screen Trade" (William Goldman)