What is it that prevents penises from growing after puberty?

Bandit74
Yeah I know everyone hates dick questions, but I think this one is at least somewhat unique... maybe.

So my understanding is that it grows during puberty when exposed to certain hormones but then stops but I never really understood why we couldn't increase it more after puberty with something like hormone treatments.

With height the explanation is supposedly that our growth plates fuse preventing further growth which is why growth hormone supplementation only helps increase height in those with short stature if taken when the growth plates are still open.

So do penises have a mechanism similar to growth plates that prevents further growth, if not why is it we can't increase the size after puberty?
What is it that prevents penises from growing after puberty?
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