Men can make their penises bigger. If you are overweight, losing 35 pounds adds one inch to the penis. Unfortunately, this rate of "growth" slows as you lose weight. Technically, you're not actually making it grow but, rather, losing the pelvic fat that's currently covering it. As you gain weight, the fat engulfs your penis and crowds out the light and you may begin to feel that it's "out of sight, out of mind."