Dr Ventura told the Daily Mail: “To make a male contraceptive have either been hormonal strategies, which would produce a lot of sexual side-effects or effects on masculinity, or they would make sperm dysfunctional, which might produce long-term effects on offspring.”

However there are likely to be concerns from women who fear men will fail to take the pill for it to act as a reliable form of birth control.

The findings have been published in the Proceedings of the National Academy of Sciences and the pill has been shown to work in male mice, whose sperm was undamaged by the process.

If the pill is proven to work in men, this would increase the number of contraception options available to them as they currently only have condoms or a permanent surgical vasectomy.