Really, I think so.
You don't? Care enough to point to a counterexample?
Lack of real-life societies which enslaved all their women should be a big hint.
Think about it for a bit. Half the population is slaves. Somebody has to watch them, guard them, suppress their attempts at rebellion, etc. Your hypothetical society will have to spend a LOT of resources on just keeping things under control while having significantly lower economic productivity. And in the case of war they can't field a large army because a lot of men are prison wardens and can't leave women slaves unattended.
The idea is just very obviously bad and unworkable.
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