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I think the evidence for other treatments is probably dubious at best.
Shrinking penis Q.
Up-to-date information on this topic can be found here:
You have asked for a great deal of information which you can get hold of on this site without me repeating it all.
Being overweight itself however, as you correctly point out, means that a fair proportion of it is hidden.
This is probably because it is the biggest job the body has to perform in a short time.
Various concerns about penis Q.
My penis appears shorter than other men I have seen.
I always did the photograph first.