Youngsters RANDY will soon be able to rub the contraceptive gel in their hands to prevent partner's pregnancy.
Fat has a hormone that reduces the number of men to zero and can replace the pill, cuticle and condom.
Scientists now want 80 couples for a two-year trial.
Prof. Richard Anderson of the University of Edinburgh, who helped in his development, said: "This will allow men to share responsibility for avoiding unwanted pregnancies and give control over how to become a dad.
"And the gel may be more appropriate than the repeated injections of previous studies."
The gel lasts four months to stop sperm production altogether.
Sperm levels should be normalized about six months after cessation of daily treatment.
It could be available for three to five years.
Professor Anderson's colleague, Dr. Cheryl Fitzgerald from St. Mary's from Manchester, she added: "The potential for contraception for men is limited to condoms and vasectomies.
"It will enable them to control their fertility in a safe and easy way."
Bekki Burbidge, of the Family Planning Association, welcomed the trials.
She said: "Many men would be interested in a new contraception that would make it easier for their partners. But it does not protect it from SPI, so it's important to continue using condoms. "
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Dr. Geoff Hackett of the British Society for Sexual Medicine added, "Many will greet him.
– But women probably will not rely on a man to use it properly. This can be different in long-term relationships. "
About 11,000 males have NHS vasectomy each year, while 3.5 million women receive pills.