British scientists created a new male contraceptive method which has been found to prevent pregnancy for up to two years.
It works by injecting gel into the vas deferens – the tube which transports sperm from the testicles to the urethra – to block it.
Contraception options for men have not changed in a century, remaining limited to condoms or the more drastic decision to have a vasectomy.
But an injection which blocks sperm from leaving the body is a new breakthrough in the search for a male equivalent of the Pill.
A previous jab, using hormones to disrupt sperm production in the brain, was found to cause side effects including depression and muscle pain, which saw 20 men drop out of a year-long trial.