The only effects of masturbating too much are potential irritation/chafing from handling yourself too roughly, and potential difficulty maintaining relationships and/or attending to responsibilities if masturbation becomes an addiction. Anything you've heard about masturbation stunting your growth, causing blindness, hair loss, hair growth, etc. is a myth.
An extender is designed to provide gentle and painless penis traction. The device fastens around the base of the penis and around the corona glans (head), offering a fully adjustable traction apparatus. When you gradually increase the longitudinal force on the shaft of the penis, the body’s natural reaction to this force is multiplication of tissue cells and gradual expansion of the penile tissue. In other words, the penis gradually adds tissue for a larger and longer penis. But be careful with these devises, some of them can traumatize your penis.
Even those penile extenders and stretchers that claim to work over time would actually just be stretching your flaccid length, and that has absolutely no correlation to how big you get when hard, says Fisch. So don’t waste your money on a product or service that swears it can give you five more inches. “There’s no actual scientific study that they rely on."