Theoretically, as long as the proper use of condoms, the contraceptive effect of up to 97%, may be a matter of fact, put on the contraceptive effect of condoms, only 80% -90%, which is Why?
The usual reasons are:
1. Accidental rupture during intercourse: for example, rate sexual intercourse too large; fingernails or rings inadvertently drawn chaos, resulting in ultra-thin shape condom breakage;
2. Ejaculation, the condom was broken in the process of sperm overflow;
3. Physical contact for too long they did not wear a condom has a small sperm injection;
4. Condom product quality, but off (rarely);
5. In the process of sexual intercourse, there is no proper use of condoms;
6. The use of improper lubricant: it was observed that if a condom coated with mineral oil and vegetable oils such as Vaseline, ordinary lotion, will be in 5 minutes reduced the strength of latex condoms;
7. Storage wrong: condoms exposed to strong light, heat, humidity and ozone environment will lose its strength.
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