Quote:
Originally Posted by Alta
Plus I am sure that it takes millions of sperm, forcibly ejected near the top to even make it all the way to the egg. So, no.
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Well, it can be done much more easily than that. Ejaculating just outside the vaginal opening, for instance, can result in some sperm entering the vagina, and it really honestly does only take one. For that matter, pre-ejaculate contains some sperm, so even withdrawal isn't a workable method of birth control. But the situation the OP describes, it's unlikely in the extreme that any sperm transferred.