Start 'em young.

[An excerpt from Cultural Anthropology]

• Among the Trobriand Islanders... children who have reached the age of 7 or 8 years begin playing erotic games and imitating adult seductive attitudes. Within another 4 or 5 years they begin to pursue sexual partners in earnest-changing partners often, experimenting sexually first with one and then another. By the time they are in their mid-teens, meetings between lovers take up most of the night, and affairs are apt to last for several months. Ultimately, lovers begin to meet the same partner again and again, rejecting the advances of others. When the couple is ready, they appear together one morning outside the young man's house as a way of announcing their intentions to be married.