C'mon, you know you're curious. The male body holds many mysteries. Why are guys always scratching their balls? What exactly is a foreskin supposed to do? But the most pressing questions we have concern semen—also known as ejaculate, spunk, and by a host of less printable nicknames. Sure we know it contains sperm, but what else is in there?
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Since the late s, scientists have explored how to produce sperm where all of the chromosomes come from a female donor. Creating female sperm was first raised as a possibility in a patent filed in  by injecting a woman's cells into a man's testicles, though the patent focused mostly on injecting altered male cells into a man's testes to correct genetic diseases. In , Japanese scientists partially confirmed such techniques by creating chicken female sperm in a similar manner. It is therefore concluded that most of the W-bearing PGC could not differentiate into spermatozoa because of restricted spermatogenesis.