eli5 How exactly does the penis stop growing?

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eli5 How exactly does the penis stop growing?

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As in an erection? Or as in growing up?

In terms of during an erection?

The penis is basically a blood sponge – when erect, the spongy tissue in the penis is filled with blood which causes the penis to enlarge and get hard – there’s only so much blood the tissue can absorb and at that point it stops growing.

When a man reaches physical adulthood the growth hormone (somatotropine) stops producing. Therefore the man, and his penis stop growing. The actual size is coded in the DNA.

My brother in law wanted to become a scientist to have an “ever growing penis”

He encouraged all the nieces and nephews to pursue science as well