On the same topic, my wife saw part of a show on UK TV (Channel 4, natch) that suggested that suitable manipulation (a firm tug with a twist, apparently) could result in a size increase. So, prostate protection and a bigger penis - win/win.
My comment was that if masturbation increased the size of the penis, teenage boys would be tripping over the things. On the confirmation side, guys that claim to have big dicks are invariably tossers, so…
Si