A small penis isn’t more sensitive than a larger one, but surprisingly there is some correlation, many men with a relatively small penis report that they ejaculate prematurely. From the purely medical point of view, this could be conincidence, but not from the psychological. No matter how important or unimportant penis size is for the female partner, men with a smaller penis often feel unsecure, at least subconsciously. Insecurity leads to stress and bodily tension, which encourages coming too fast. This subjective failure causes even more stress the next time, a cycle that’s hard to break. That’s the main reason why penis enlargement often assists in lasting longer in bed, too.
However, after more than a century of generally dubious and sometimes lunatic penis enlargement attempts, there's still not much you can do. Sure, there are lots and lots of supposed options out there -- penis pills, creams, brutal stretching exercises, horrific-looking devices, and penis surgery. Almost none of it works. The few approaches that can work often have modest benefits and serious side effects. How serious? In some cases, erectile dysfunction-serious.