And, God would have given kids longer to develop so that their ability to perform sexually would coincide better with the accepted age of marriage and starting a family. God is not the author of confusion. The talent of generating confusion is reserved for those who proscribe what God does with man made codes and assumptions. All the sex perverts, exhibitionists, and sex criminals of all the ages masturbated before they got around to criminal sex. We don't need to prove anything, but we do need to stop making cases for morality based on stupid statistics and notions.
Masturbation becomes a problem when boys masturbate together.
This kind of social masturbating, or stag party, often leads to acts of sodomy as boys start stimulating each other. The solution is to teach young people that masturbation is a private matter and should not be made public. This will help them to realize that sex in marriage is also a private matter between husband and wife. Neither form of sexual stimulation should be the subject of gross humor and light conversation. Telling jokes about masturbation pushes the thing into the dirty category.