Why does girls and guys hit puberty younger but if they have sex before 18 they get in trouble?

Nature vs culture. I've always thought it sad kids got all the physical parts & urges of adulthood long before the wiring in the brain finished. Reproductive urges probably did humans well thousands of yrs ago when people seldom lived past 40. Now the society u live in wants u to wait & recognize the good/bad choices for what they are. No body owes u a living or easy access to sex.Welcome to the real world.