SilentOne answered Saturday November 10 2007, 5:30 pm: I'm not sure if it's all, but most condoms have "nipples" on them, to relieve pressure when a guy orgasms. Those nipples can tend to retain air. If you don't get rid of the air by combination of careful pinching, and massaging any bubble out before unrolling the condom, it leads to a higher failure rate. Reason: Any bubbles left increase the tension on the latex (or alternative material), and can lead to the material popping.
If you have had sex, and the condom did not appear to be leaking, or broken, then it is likely your condoms have not failed, but unless you take care in application, it's just a matter of chance.
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