I took a look at c/feminism and I believe the links shared over there are very good introductions to Marxist feminism. Particularly this essay and this one. The Revleft Radio episode linked over there is also great.

But if you’re interested in Kollontai, I was introduced to her with this book. I have found a podcast that revolves around her but I haven’t had the time to listen to it so I won’t recommend it (but I’m sure you can find it easily). I haven’t listened to the Revleft Radio about her either, so give it a listen and tell me what you think about it if you want.

I will be honest though. I was introduced to the Communist line on pornography by the copypasta posted on r/moretankiechapo in response to any liberal takes on porn. It’s a shame I can’t find it, I was scandalized by it haha. F, r/mtc.

P.S.: If you still have access to r/gzd I’m sure you can find some old threads about it, just ignore the liberals promoting choice feminism.