Anyways it does seem that testosterone does cause the penis to grow even when the male is an adult but the catch is only if the person has had very very low levels during puberty. In this study (http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3214853/) HCG was given to men (HCG increases testosterone levels via signaling the testes to produce testosterone) with an average age of 18.9 (range 12 to 24). After 24 weeks stretched length increased from 5.41 cm to 7.45 cm. So you can see these guys had very low levels during puberty so their size was very small. It would be unlikely an average guy would see an increase while taking HCG as he would have probably had a high enough testosterone level to fully develop.
Also I have a question relating to average size. What do you think the average shape of the penis is? Mine has a very pronounced upward curve to it (around a 35 to 40 degree curve that starts 1/3 the way up). I don’t think it’s caused be scar tissue because I’ve had it for as long as I can remember and I can’t feel any hard tissue when it’s flaccid.
They were still in puberty.
Even the older subjects (=18 years) were effectively in puberty due to hypogonadism.
Kdong Starting: 7.1 x 5.125 vol = 14.84 cu. in. Current: 7.375 BPEL 5.5 MSEG = 17.7 cu. in. GOAL --> 8.5 x 6.5 vol: 28.6 cu. in.
Took Time off, lost some gains-- started back 5/13/15