RH Reality Check has the details.
Briefly, two options involves blocking, rather than cutting (as in vasectomy), the vas deferens. Potentially a less troublesome surgical procedure, and more likely to be reversible.
This has been successfully tested in other primates, so things look promising for humans, although of course nothing is certain.
New types of spermicides are also in development, as well as means to prevent sperm from merging with eggs.
Clearly, there's interesting stuff going on.
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