In Mangaia, an island in the South Pacific Ocean, boys around the age of 13 have sex with older women who teach them the intricacies of the act and how best to please their partners.
The Mangaian boy hears of masturbation at about 7 and begins the practice at age 8 or 9. At age 13, he undergoes the superincision ritual (a slit is made on the top of the penis, along its entire length) and the expert who performs the surgery gives him explicit sexual instruction.
About two weeks after the operation, the boy has intercourse with an experienced woman who provides him with practice in various acts and positions. She specifically trains him in restraint so that he can have simultaneous orgasms with his partner.