Scientists have developed male contraception which prevents sperm from leaving the penis during ejaculation.
This blocks the two main proteins in the brain that are responsible for releasing swimmers during a male orgasm, Mailonline reports.
It must also have the ability to increase libido by dilating blood vessels – just as Viagra works.
Leading researcher Dr. Sab Ventura said the research would begin when the next phase of drug development was successful,” he said.
He continued, “We are trying to develop a combination of two drugs that simultaneously block the transport of sperm instead of interfering with the development or maturation of sperm.
“With this non-hormonal approach, sperm remain unaffected so that contraception is easily reversible after stopping the drug.”
Early laboratory tests showed that the drug did not affect sexual desire.
And this preliminary study shows that sperm stays healthy and fit when men express future desires to children.