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Why does penis growth does not respond to testosterone after puberty?

Penis enlargement procedures/surgeries are not that effective yet. I was wondering why there isn't any hormonal treatment that increases penis size in adults after puberty. Why the receptors in our penis tissue stop responding so well to testosterone after puberty? Biochemistrily speaking, why can't we simulate the puberty hormonal environment in an adult, even a little, and get a measurable penis growth? I find it very weird that with our current medical technology this is not yet possible, although there is a very high demand for it.
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134578 tn?1642048000
The body grows and stops growing in response to the complicated interactions of all of its systems. It's not as simple as "add one hormone, get a certain response."

Also, if you are an average guy and believe that somehow your penis size reflects your self worth, frankly please re-think this mental set. Men who don't understand what women like try to rival each other in penis size, but women could not care less if a guy's penis is longer than average. In fact, too long and it hurts, because her vagina isn't that deep. It's not a beauty game, it's not a dominance game, it's what you do with what you've got.

If someone has a genuine 'micropenis,' it's possible he would want treatment for hypogonadotropic hypogonadism. But even guys with micropenises can please a woman, since all the nerves in her vagina are in the first third anyway.
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My penis is not small, I don't think penis size reflects self worth, I don't rival any man for their penis size, neither I like women. Also, this is not a topic about "how to be happier with your current penis length".

I am asking in a medical sense, what are the changes an adult experience that prevent medicine from creating any surgery, procedure, or hormonal therapy that really works. Breast silicone implants work perfectly for woman, but penis silicone implants are far more complicated and far less effective.

Also, the penis is one of the few structures in our body that we are unable to grow after puberty. You can go to the gym or take steroids and grow your skeletal and somewhat your smooth muscle tissue. You can eat a lot and grow your adipose visceral and subcutaneous tissue. Some hormones (like the Growth Hormone - GH) can even grow your bone tissue. Your hair and nail does not stop growing, neither your nose and your ears, that are composed primarily by connective tissue. And although penis is composed by muscle and connective tissue primarily, nowadays it is still practically impossible to grow it using hormones or exercises after puberty.

Of course it's not that simple, but we are in 2022 and plastic surgery is a 50 billion dollar market. If scientists still didn't find a solution, it's because there is some important stuff going on.

We know GnRH is released during puberty and stimulates the production of LH and FSH which stimulates the production of testosterones. We can inject all these 4 hormones in a health adult and his penis is not going to grow. We know testosterone receptors are lower in adulthood, however we can still increase their density with PDGF and we still don't see a change. And if you think the problem in because of cellular differentiability, we also can inject stem cells in the penis and do all of the above and we still don't see a length gain.

So of course is more complicated than that. I want to understand why.
Well, then, probably the answer is, someone somewhere is working on it, since as you say there would be interest in the topic from at least some men.
We try to answer questions here related to a health concern someone has.  Can you not see a problem if the body doesn't by nature stop growth? By 80, a man's pants may not fit, I'm just saying. It's nature. We do not grow in a noticeable fashion after puberty including our penis.
This is related to the same issues with bone age. the body does not grow forever and will cut off soon after puberty no longer responding to hormonal treatment. Penis size is basically determined like all other issues of our 'size' at birth.
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