According to the World Health Organization (WHO) the stuff isn't overly effective:
Quote:
* Although Nonoxynol-9 has been shown to increase the risk of HIV infection when used frequently by women at high risk of infection, it remains a contraceptive option for women at low risk.
* Nonoxynol-9 offers no protection against sexually transmitted infections such as gonorrhoea or chlamydia.
* There is no evidence that condoms lubricated with Nonoxynol-9 are any more effective in preventing pregnancy or infection than condoms lubricated with silicone, and such condoms should no longer be promoted. However, it is better to use an Nonoxynol-9 lubricated condom than no condom at all.
* Nonoxynol-9 should not be used rectally.
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From this site:
http://www.who.int/reproductive-heal...onoxynol9.html