A contraceptive injection given to men once a month could be as effective as the female Pill or condoms.

The testosterone jab is administered in the buttocks and works by regulating two brain chemicals — follicle-stimulating hormone and luteinising hormone — which has the effect of blocking sperm production temporarily.

Testosterone is vital for sperm production, but if the body detects too much it shuts down its sperm production.

A two-year trial in China involving 1,000 men found the injections were 95 per cent effective at preventing pregnancy.

Six months after stopping the jabs, all but two of the men’s sperm counts were back to normal.

While the results seem promising, a third of the men dropped out, suggesting they were unwilling to undergo the ordeal of monthly injections and potential side-effects that include mood swings, lower sex drive and acne.

Furthermore, previous studies show Asian men are more responsive to testosterone than European, possibly because of their genetic make-up and lower body mass index.

So in the West an additional hormone such as progestogen may need to be added to shut down sperm production.

‘Five per cent of men will not get sperm count down to a level for it to be a reliable contraception,’ says Professor Schlegel .

‘In addition, there is a two to three- month time lag from taking the testosterone to stopping all sperm production, so couples would need to use another form of contraception until then.’

Available: In five years.

Chanchit: E remain cream to prevent HIV, wey man go fit take robb joystick before penetrating...

Judeoxide: finding cure for HIV has for years not bin succesfull gonorea has eaten dip into asian nd all day can do is bring out injections dat promots more sexual imoralities..at d end it will end up hitting hard on africa dats just my problem..

alaoeri: Another strategy to reduce population it won't work in africa bcuz an average african man won't dear it.

youngchopper: Is dat suppose to be funny? we talkin money n u talkin nonsence. Wat is cream shit?

feelamong: This wont work!! With the attendant side effects?

Am not sure anyman will want to take the risk of those side effects like Mood swings and lower sex drive? damn!

alaoeri: Another strategy to reduce population it won't work in africa bcuz an average african man won't dear it.