- Puberty — Defined — Boys are considered to be sexually potent at the age of puberty which usually occurs at the fifteenth or sixteenth year — Sexual intercourse is possible at about thirteenth or fourteenth years — The changes in a body at puberty are development of genital organs, the ability to secrete semen, the growth of hair on the pubs, axillae and chin. Sheraz Mahmood v. The State & another 2006 SCR 39 (D)