If “V” is for vascular, then I agree that VSM probably does grow in response to certain forms of PE, especially jelqing. I think it’s also likely that smooth muscle in the sinusoids, which aren’t part of any specific vein or artery, also grow in response to PE, but I think that growth is likely in proportion to the increase in penile size. That’s just a guess, though.
My guess would be that a healthy penis needs a certain composition, and that implies a certain percentage of smooth muscle which probably behaves more like a sphincter rather than vascular smooth muscle. In order to maintain good erection quality as a response to tunica enlargement I suppose that the smooth muscle must grow in order to maintain the “healthy” (erection wise) proportions within the penis.
Later - ttt