Why the interrupted certificate or act with a condom is reliable on 50 65 %? Unless it not luchsh...

[Tatyana]

Why the interrupted certificate or act with a condom is reliable on 50 65 %? Unless it is not better than posto a condom? If my partner not against such method that unless is not reliable way (then I still check a condom on integrity?).
What for condoms such with spermitsidami? And if thus to use them?
Thankful in advance for the answer.

[Soboleva L.I.]

Dear Tatyana! That you add to a condom the interrupted sexual certificate or act reliability of contraception does not increase or is not enlarged. Vo-the first because in a condom can be formed a pore (the spermatozoon easily through them will get, and you and do not sweep up or will notice them). Vo-the spermatozoons second a part it is allocated up to an ejaculation, and it is enough for conception only one spermatozoon. There are condoms with spermitsidnoj greasing (look or see in drugstores), but the combination of good condoms and spermitsidov (candles, a cream, tablets, sprays) is more reliable.