The penile tissue stops growing as your physical body, I would like to say at about 18, when the hGH and DHT level pass their peaks. In fact, the penile size varies from time to time. The DHT level and its receptor density in the penile tissues determines the ultimately ballooned (powered up) penile size, which can be about 140% of the normal erection, at the moment when the neuro-endocrine function produce a burst of DHEA/testosterone/DHT and the parasympathetic nerves releases a significant amount of nitric oxide to the penile arterial tissues. Developing more DHT receptors will give you a bigger penis in the erection and power-up (ballooning) states. The ballooning effects of the penile side are not limited by the calendar age, but the sexual age. A 18-year old boy can experience impotency and shrink his penis by starting over-masturbation at age 10-12 . Overmasturbation will stop or reduce the physical body growth because overmasturbation uses up too much Homan Growth Hormone to support the DHEA, testosterone and sperm production.
The actual penis size at the moment of ejaculation depends on the bioenergy (the release of nitric oxide) in the parasympathetic nervous system. During that ejaculation moment, your penis becomes maximum in that love session. You may have a different size and rigidity of your penis in different love session, depending on your hormone levels, the nitric oxide (parasympathetic function) production, and the stress hormone (sympathetic function) levels. The size can be expanded by increasing the bioenergy (nitric oxide) level in the parasympathetic nervous system and by enhancing the DHT level with a testosterone burst. A 5" normal erection can be expanded to a 7" one by practicing the stop-ejaculation 3-5 times. This is my natural Penile Enlargement Method. Men can do it through intercourse or massaging the penile base/footing/low-portion shaft, as described in
http://www.linplaza.com/cases/case7648.htm. This is called the Penile Power-up Method with sexual intercourse, or the Ballooning Method without intercourse. With Intercourse, extracting the female sexual energy in the Epicenter's bioelectric cells can make the penis expand to an absolute maximum, like a penile pump can do for you.