I think the word your looking for is ejaculation and you'll know because a milky white substance will come out of your penis.
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Do you know the meaning of know? No, I do not know. I know the meaning of the word no.
I know / I do not know.
Doesn't know
We so know what genes people have, and we know what genes many other species have. We also know what some of these genes do, and we even know in some cases how they do it. But there is a great deal that we don't know. At a guess, we only know 1% of the full explanation of what genes do and how they do it.
It means that everything you know or learn expands your knowledge. The more expanded your pool of knowledge is, the bigger the unknown part becomes. In effect, "the more you know, the less you know".