I do see a market with this, but it's got a lot of problems you'd need to navigate. Nothing a smart team couldn't figure out.<p>Most of the time, men trust women when they say they're on birth control. Women get pregnant--a big deal. It's less likely (but not unheard of) that a woman wants to get pregnant and then lies about birth control.<p>Men, on the other hand, would love to not use a condom. And men don't get pregnant. So saying "yeah baby, I've had my shots" would probably be a lot more common.<p>You'd need to market this to couples. Relationships with trust--not teenagers. Or, as an "and-1", extra step prevention. Not as a first line of defense. Then, the low cost would be more of an extra procedure that would get them thinking more about being safer. You wouldn't hang your business model on it but could actually do more business by offering it.<p>Lastly, being a man, the idea of someone putting forceps in my scrotum gives me the willies. Just sayin'.