Sure it's a form of sex, it's called "ORAL SEX" haha.
But as for whether I
consider it to be an act of sex? No,
in my mind, "sex" is penetrative. However, I am not disputing that oral sex is a form of sex.
And as for the comment regarding cheating, of course performing oral sex on someone not in your monogamous relationship would be defined as cheating, but in my opinion, other things could be considered cheating as well. I'm going to start another thread on this because I don't want to derail LSD's thread

Very interesting thread LSD, I rather enjoy your posting.