The amazons are hardly a typical matriarchal society.  In RL, men were
warriors even in matriarchal societies because greater strength and 

size

are usually advantages in pre-gunpowder combat (including missile 

weapons).

Because of the prowess of the female amazons, the males of Joketsuzoku
aren't as valuable as warriors. 

   There's one other reason that men were the warriors in most societies 
in history:  We're more expendable, in terms of survival of the tribe.  
How does a tribe of a few hundred (or less) members recover from a war 
with their neighbors?  By making a very large next generation.  For 
that, the limiting factor is the number of breeding-age females.
   Heck, even if all the young adult males were wiped out, a few old men 
(past their combat prime) and a handful of adolescent boys could 
repopulate the tribe in short order.  Decimate the same segment of the 
female population, and the tribe will be gone in forty years.
   This males-are-expendable-spear-fodder theory would probably be 
stronger in a matriarchal society.

--Freemage

                                                dml

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