Don't you know that the ability to become pregnant doesn't define you as a woman? Men can have babies too, now!
if the perception of one's womb is that it's a male womb, why not?
Because male specifically means that you don't have a womb. It's the definition of male.
All the cultural shit is ephemeral. Trousers, skirts, long hair, short hair, manual work, pink and blue - it's all male or female, depending on your century, your associations, your environment.
NOTHING cultural is actually, definably male. Therefore the only valid, scientific definition of male is a biological one.
Culturally, anything goes.