A gel injected into the scrotum could be the next male contraceptive::Biotech company Contraline has safely implanted a sperm-blocking hydrogel in 23 men. It’s designed to be a fully reversible vasectomy.
Would be cool to have a remote control device that mechanically opens/closes the tubes, built-in security layer for ensuring only you can unlock it, auto-lock, etc. If the tech-bro venture capitalists weren't weirdos about spreading their genes around maybe this would be a thing.