The morning after pill - known as emergency contraception can prevent pregnancy after unprotected sex or if contraceptive method has failed.
Presently, it is available for women, and is designed to prevent or delay the release of an egg.
This pill would be for both men and women, and can be taken up to five hours after unprotected sex. Olives
reduce sperm fertility because they contain a chemical which suppresses activity and strength of the sperm tail, preventing it from reaching the egg.
The same chemical is also found in grapes and mangos.
Researchers at the University of Berkeley said the contraceptive could be available within two years for women to take before or after sex, and within four years for men.
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