It had to be pointed out to me before I accepted it myself but apparently the United States falls behind a bit in the sexual arena. Outside of our borders, what is and what isn't considered to be sex is not so limited. Whereas within, Americans largely view physical pleasure not involving intercourse as not being sex.
1) Do you think sex absolutely must have intercourse as a necessary component? 2) If you don't, then if lesbians aren't having sex what exactly are they doing? 3) Why do you suppose people don't view cunnilingus & fellatio as being sex?