More than 100 million women worldwide take birth control pills, but that number might drop if a new project by British scientists works.
Researchers in England are working on a contraceptive pill for men.
It's a hormone-free pill that stops the release of sperm without interfering with pleasure, researchers said.
Men could take a single dose a few hours before having sex, then within twelve hours be fertile again.
The new pill is more user-friendly than other methods already on the market that require men to inject themselves with medicines or wear patches, researchers said.
"It's not stopping sperm production. It's not a hormonal method, it's just simply stopping the muscle which takes the sperm along," said Dr. Christopher Smith, a researcher at King's College London.
It's not on the market yet, but if the pill is approved, it could be available within the next five years.
