THE belief that Coca-Cola works as an after-sex spermicide is nothing but urban legend, a scientist cautions in the British Medical Journal (BMJ) on Thursday.

Deborah Anderson, a professor in obstetrics and gynaecology at Harvard Medical School, says that Coca-cola douches were sometimes used in 1950s and 1960s America in the belief that the drink’s acidity killed sperm.

Soft-drink douches are still used as a post-coital contraceptive ploy in some poor countries, she says.

To begin with, Coke is not a very effective spermicide, as it is unlikely to kill the target.

And even if the beverage’s secret recipe were lethal, a speedy sperm is likely to outswim the douche and get to cervix first.

In addition, Coca-Cola damages the top layer of cells within the vagina, and makes a woman more prone to sexually transmitted disease. And while it is largely harmless to sperm, soda pop removes healthy bacteria, opening the way to fungal and bacterial infection.

Experiments with other forms of vaginal douches have found an increased risk of pelvic inflammation and ectopic pregnancy, in which a fertilised egg is implanted in the fallopian tube, rather than in the uterus.

Finally, says Ms Anderson, there is the simple fact that there are much more effective and easy-to-use methods of contraception widely available.

This article just begged to be posted.