Most gains vs. Least gains:
According to the results, the men that never masturbated gained the most -- with an average penis size increase of 66.23 percent. Thus, the men that never masturbated added an average of 9.45 cubic inches to their penis (That's a lot)!
The men who gained the least masturbated once a day -- with an average penis size increase of 21.11 percent. Therefore, the men who masturbated daily added an average of only 2.66 cubic inches to their penis...