RANDY HATS will soon be able to dispose of an army anticonceptive gel to help pregnant partners.
The ointment has a hormone that reduces somewhat male sperm and can replace pills, oils and condoms.
Scientists want 80 pairs of two pairs of couples.
Prof. Richard Anderson, from the University of Edinburgh, helped develop: "Men share responsibility for preventing unwanted pregnancies and controlling their father's conversion.
"And rehearsals may be more complex than previous rehearsals in previous trials."
The gel lasts for four months to stop sperm production.
Sperm will normally return six months after treatment has stopped.
It could be three or five years.
Prof Anderson's colleague, Dr. Cheryl Fitzgerald, from St Mary's Hospital in Manchester, added: "Opportunities for men are limited to condoms and vasectomies.
"This allows fertility to be controlled safely and simply."
Bekki Burbidge, Family Planning Association, approved the test.
He said: "Many men would be interested in new contraceptives, when their partners facilitate responsibility, but it does not protect against ITS, so it is very important to use condoms yet."
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Dr. Geoff Hackett, British Sexology Medical Association, added: "Many will be welcomed.
"But women can hardly recognize that a man can use it properly. Long-term relationships may be different."
11,000 men have NHS vasectomies each year, while 3.5 million women get their pills.