Once torn at all, latex is really delicate. And the friction during most sexual activity with condoms, intense. So, what might start as a small tear will generally quickly branch out.
The idea of teeny tiny microscopic holes in condoms is actually myth perpetuated by propagandists to scare people away from safer sex and thus, sex. Teeny, tiny holes are only likely to occur if you're using agents with the condom which could degrade it -- like oils or vaseline -- of if you;re using a condom waaaay past the expiry date, or which has been stored improperly for a while. And you should never do those things period, so.
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