"Hooking up" was a term known in the year 2000 to almost every American child over the age of nine, but to only a relatively small percentage of their parents, who, even if they heard it, thought it was being used in the old sense of "meeting" someone. Among the children, hooking up was always a sexual experience, but the nature and extent of what they did could vary widely. Back in the twentieth century, American girls had used baseball terminology. "First base" referred to embracing and kissing; "second base" referred to groping and fondling and deep, or "French," kissing, commonly known as "heavy petting"; "third base" referred to fellatio, usually known in polite conversation by the ambiguous term "oral sex"; and "home plate" meant conception-mode intercourse, known familiarly as "going all the way." In the year 2000, in the era of hooking up, "first base" meant deep kissing ("tonsil hockey"), groping, and fondling; "second base" meant oral sex; "third base" meant going all the way; and "home plate" meant learning each other's names.