It is notable that many men see getting a bigger dick )usually that means bigger and better to do lots of screwing) goes along with getting fitter and leaner. With many, I think this aspect is also about getting more and better sex. The stories on this and other similar places are so full of instances where a man in his 20s or 30s relates how he has come to realise that he wants, needs, to look, feel and perform (sexially) like a man and not a boy. Looking back to my own dim distant past, this was a change that came in my late teens.
There is plenty of evidence that PE and related improvement activities actually work. So why not do yourself a favour? I wish I had known then what I now know.