I didn't do it as a teen, but I know that the structure of the penis is different from the rest of the body. Doctors advise you not to lift weights when you are young because injuries from load bearing exercises can damage your frame, stunt your growth, or in cause you to grow misshapen in extreme cases. Considering the penis is pretty much entirely vascular, I don't really think that it would be an issue. In fact, I think that traditional jelqing in arabic cultures started when the boy was in his teens, so it's probably safe. I don't think it'll give them Quasimodo-dick or anything. :tongue: