when you are age 1 to 10 the are small when you ages 11 to 12 they start to get big
when they are hard and it feels good to rub it a.k.a masturbating and then semen,cum,or sprem
doing sex woman like to suck it a.k.a blowjob use the hand rub a.k.a handjob or use their feet a.k.a footjob and woman
like in their
ass or
vagina