人之初: At the beginning of life,
性本善: Sex is good.
性相近: Basically, all the sex are same.
習相遠: But it depends on how you do it.
苟不教: If you do not practice all the time,
性乃遷: Sex will leave you.
教之道: The way of learning it,
貴以專: It is very important to make love with only one person.