A once technological world has fallen and now the world is divided by those dominated by women and those dominated by men. Both sides treat each other as slaves when captured and don't help the cause of relations between the sexes. There is no balance in this world and when some crystals are stolen from the Amazons they give chase. Of course they're captured and enslaved and basically raped. There's a lot of sex and rape in this book, with people being abused to the realisation that they either succomb or die.
I've read one other series that reads like this - Gor - and thankfully I've only read one of that, this will be the last of these.