i consider it sex, but i think sex is personally defined. lots of people may not enjoy or want to have penetrative sex at all, and may therefore consider frotting to be sex for them, etc.
i definitely consider oral, fingering, and anything of a definitively sexual nature to be "sex".
(also re: the only sex with two vulvas being scissoring??? do that many people really even scissor?? it seems so ineffective and clumsy)