It looks like a bunch of important & valid points being suborned to a single idea which ignores biology.
Just to point out, female biology doesn't mean that sex equals penetration. In fact, many lesbians seem to manage quite nicely without any penetration at all. But many males (gay or straight), DO seem to think that the ONLY valid thing to do with a penis is stick it somewhere, and only differ in terms of exactly which hole they are sticking it in (plus I have found that some gay men are just puzzled how some lesbians supposedly manage without even a plastic pseudo-penis dildo, because no penis equals no sex as far as they were concerned!).
I was rather taken aback by its premise.
As far as I'm concerned this is a good thing! Why, after all, should penetration be synonymous with sex in the first place? Separating sex as sex, from the reproductive act, why should it involve penetration at all? Indeed, for lesbians, penetration need not be involved at all in sex, and only minimally in reproduction, with a turkey baster (usual implement for self-insemination). So why the focus on penetration as sex, who does it serve?............
Indeed, you could view FGM as the ULTIMATE statement of sex=PIV in that the purpose of FGM is to remove the clitoris (hence there goes pleasurable sensation for the woman), and to make the vaginal opening as small as possible (and who is THAT for?).
Then we also have what I seem to recall Andrea Dworkin was writing about in 'Intercourse', that penetration is problematic given the current culture of sexual inequality. And I think this is reflected by gay men as well, where the submissive partner is the one who is penetrated, and the dominant is the one who does the penetrating. I think you can see there what goes back to the greeks, that woman IS the thing who is penetrated (and that a male who allows himself to be penetrated is mocked as being a woman!). Just as vagina means sheath (for the penis). I think she didn't mean that ALL intercourse/penetration IS rape. But these ideas of sex ARE tightly bound up with both sex equals penetration (by a penis or a substitute for a penis), and that penetration also signals inequality.
What would sex look like if we had sexual equality?