RANDY's friends will soon be able to collect a contraceptive gel in their hands to stop their partner's pregnancy.
The flower has a hormone that reduces the number of men's sperm to zero and can replace Pill, snip and condoms.
Scientists now want 80 pairs for a two-year trial.
Professor Richard Anderson of the University of Edinburgh, who helped develop it, said: "It will allow men to take responsibility for preventing unwanted pregnancies and to control when to become a father.
"And the gel can be more convenient than repeating previous injections."
The gel lasts four months to completely stop sperm production.
The level of sperm should return to normal about six months after the end of treatment.
It could be available within three to five years.
Prof. Anderson's colleague, Dr. Cheryl Fitzgerald from Manchester St. Mary's Hospitals added: “For men, contraceptives are limited to condoms and vasectomies.
"It will allow them to control their fertility safely and simply."
Bekki Burbidge, from the Family Planning Association, supported trials.
She said: "Many men would be interested in new contraception, which will make it easier for their partners to take responsibility. But it doesn't protect against STI, so it's still important to use condoms. ”
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Dr. Geoff Hackett, from the British Sexual Medicine Society, added: "Many will welcome it.
“But women are more likely to rely on people to use it properly. It may be different in long-term relationships. ”
Approximately 11,000 men each year have an NHS vasectomy, while 3.5 million women receive tablets.