The
primary reason that all Aes Sedai are
female is that as soon as a
male is discovered wielding the
One Power, he is immediately, well, mentally
castrated I suppose, cut off permanently from the One Power. This drives most of them into a
deep,
suicidal depression, and they seldom
survive long.
The reasoning behind all this is that the male side of the One Power,
Saidin, was tainted by the
Dark One. Any man who wields
Saidin will eventually go
mad and
destroy just about
everything and
everyone around him.