This is an area where my knowledge is limited.
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can it be surmised that if testosterone deficiency occurs during puberty the length/girth of a mans thingy would be smaller as a result of the lower testosterone levels when compared to a random group of men without gyne?
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Can be surmised- No.
I don't think it can be treated as a fact at least not from my limited knowledge, that would be too strong (although I am quite prepared to be shown otherwise).
The theory is good though and certainly an ABNORMAL level of testosterone prior to puberty would have a very good chance of reducing the size of genitalia. It often does this.
Your question is difficult for me to answer, but as I understand it genetics comes into play, testosterone in utero is a factor and dihydrotestosterone is also very important. Although I suppose testosterone in utero probably has a very good relationship with testosterone at puberty and dihydrotestosterone is derived from testosterone, so most individuals with low/low normal testosterone levels would most likely have a lower dihydrotestosterone level.
Sorry just talking to myself
No such studies are undertaken to my knowledge as it isn't really a medical concern as you are still talking about what is medically termed normal genitalia as well as those that are not. (although I may be wrong- it isn't something I've concerned myself with).
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As a generalization would you say that's not likely, likely or very likely than an 18 year old male with gyne would have a smaller (length/girth) thingy than an 18 year old without gyne?
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First of all we would have to limit the answer to gynecomastia where there was no drug causing the gynecomastia (prescribed or otherwise) and to those that are post puberty. So the whole question is a little easier if we are talking about a group of men a little older say 20 years of age- given late developers.
Then as a generalization- Yes.
As the question is less stringent.
There is very likely to be a higher percentage of men who have suffered from pre pubertal hypogonadism in the gynecomastia group as compared to the general population and because higher androgen levels that are less likely to be present in the gynecomastia group are likely to exert greater growth of genitalia than lower levels are...generally.
It would be silly for me to say anything other than what I have because my knowledge here is limited and I am quite prepared to be shown information that contradicts what I have had to say.
So there is nothing inherently wrong with a general yes to the theory from my point of view when comparing them as group’s; gynecomastia vs. non gynecomastia at the age of 20.
But because we are talking about statistics and groups we are not talking about individuals- so many of us could well be well ahem….endowed.
The funny thing is that the size of something that is a little lower- the testicles has a far greater impact on general health, libido etc- maybe our concerns should be a little lower.
Still I suppose that girls do not tend to say he had a small xyz but his balls were massive and that made up for it.
So I suppose the apparatus you have mentioned will always be of greater import to men.
I think blokes have too many hang-ups in this area and endocrinologists wouldn’t give a toss
unless there was a significant problem.
P.S
That is the best I can do sorry.