Ironically, William Clinton was correct (but for an illicit and immoral purpose):
So-called oral sex is not sex. So-called anal sex is not sex.
Coitus is sex.
Everything else is foreplay, afterplay, or sexually-stimulating eroticism of some kind.
Only real coitus - between a sexually-mature male and a sexually-mature female - can produce real zygotes.
By the bye, this means that pedophilia, even between a male and a female, is not legitimate sex, because a pre-pubescent female - or male - cannot produce the gametes necessary to then produce a viable zygote.
Boys are boys, and girls are girls; they are not androgynous, interchangeable, malleable things; they are sexed, not gendered. But they are sexually IMMATURE beings who must protected by adults.
Fifty years ago, secular scientists were emphatic that the only reason for the emotion of love was to bio-chemically induce sexually mature males and females to engage in sexual intercourse, and thus to reproduce.
They asserted that sex was real, and love was illusion. Now, the secular scientists of today assert that love is real, and sex is illusion.