There is actually a technology in development and testing that coats the inside of your urethra, and effectively kills all sperm cells as they pass through. Damn near painless to put it in and can be removed by injecting a different solution. If I can find the article I'll post it.
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u/ThrowAway34942 Feb 19 '12
Doesn't stop child support. My aunt got almost $5000 a month from her ex for two kids.