While the pill has done wonders to help women (and couples) gain more power over impregnation there is still much that can be done to give men the same power. According to a recent New Scientist article that power may lie in a patch:
The drug, called Adjudin, works by disrupting the interaction that takes place in the testicles between immature sperm cells and the nurse cells responsible for nurturing sperm to maturity.
This new method targets the testicles and stops sperm from maturing (which is different from the typical hormonal approach). I can honestly say this is the first time I don't mind my balls being the target of something.
Also, while I have never heard of these "nurse cells" that are apparently in my reproductive organs, I'm pretty sure I know exactly what mine look like.