Scientists have developed a male contraceptive injection. Soon the worldwide clinical trails to test the effectiveness of the injection as the only form of contraception will be conducted. Studies have shown that male contraceptive works in similar way as female contraceptive.

Lead researcher Professor Rob McLachlan says that the treatment keeps men's testosterone levels normal while the progestin fools the brain into not producing hormones needed to stimulate sperm production.

He added sexual function should not change because the level of testosterone in the blood remains the same.

Sydney and Melbourne's Prince Henry Institute are among ten centres to conduct the trails. Nearly four hundred couples will take part in the 18-month trial.