Thanks for mentioning this. Never heard of that before. So we have a almost 100% effective, one-time use, most likely reversible, cheap contraceptive that is free of unwanted side effects. sadly it would lessen the profit of pharmaceutical companies, so we can’t have it. too bad.

yay for capitalism!

https://en.wikipedia.org/wiki/Reversible_inhibition_of_sperm_under_guidance#Availability_and_marketing