Grabbed it too. I'm working through an anarchist theory block right now and then plan on some more Marxism and philosophy, but after that I was already planning on working through some feminist theory. So both of those seem like a good start. I'd still like to find something based on what Engels touched on at the end of Is The Origin of The Family, Private Property and The State about what post-communism marriage equality might look like. I might also add The Second Sex by Simone de Beauvoir but it's a bit lengthy.