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16cm dicklet here.
Google "PE exercises" and you'll find at least one forum in the first results. Make yourself an account over there so you can see all the evidence of it working (it's private for obvious reasons) and put yourself to it. It works but it's too much of a hassle so you won't really be constant about that unless you really want to.
I grew a couple cm and had the strongest boners I had in years after a couple of weeks or so but as I said it's too much of a bother. Eventually those gainz receded and I was left as I was initially. Apparently they stay if you do it long enough, and it's just like 15-20 minutes per day at most.
Also looking up this I learned that many porn actors used weights as a quick way to make their dongs larger (it's one of the quickest but less safe methods) and they have a mark there where the string was strapped that you can see if you bother to look it up.
