One thing is certain: there are many ideas about what modern contraceptive methods for men could look like. One of the most bizarre is the so-called testicle switch: a valve that is inserted into the vas deferens and is supposed to regulate the sperm supply at the push of a button. Studies on such projects may be interesting reading material, but a market-ready product has not yet been created. Is that changing now?
Pill for men: Does a hormone gel bring success? – Health
