@Barracker thank you for that very thoughtful reply; I appreciate you spending the time on it. I do agree with you, it took me a while to get my head around it but I have spent so much time in FWR in the last 3 or 4 years, that I think it would be difficult not to have 'got' it.
Perhaps I was just wasting time - indulging in a spot of intellectual masturbation - when I asked about abortion. It was a very specific point about abortion only though. I really enjoyed your 'Pronouns are Rohypnol' post, and I think that abortion rights are a bit like that. If the right to have an abortion is extended to men too, it would be the start of a slow (well, not very slow at all) creep towards everything being human unless you're male, in which case you are male as a subset of human and women are.....? not included in the ccategory human or perhaps included only as non-men. I do see that.
When someone asks me - and it doesn''t happen often I'm afraid, I don't have much rl contact with people who think at all these days, let alone think about this sort of abstract struff - when someone asks me what the problem with extending the right to have an abortion to people who will never need it, I have always been a bit flummoxed other than to say it's the beginning of the end, or words to that effect. I'm not sure there's actually a different answer, is there? Not different in substance anyway. (Conversations about maternity rights also follow a similar pattern.)
Very strangely round here I have a reputation for being a bit intellectual as well as a bit strange, and that I dress like a gypsy (I don't, it''s more like a hippy.) so I don't have much credibility to lose anyway.
Sorry for the hijack. Thanks to you all for trying to sort my brain out. I am more of a radfem every day, though it doesn't look much like it from this thread alone.