I have some very personal opinions about that very notion.
It's connected inexorably to puberty and millennia-old cultural projections.
M*nstruation as an integral, focal part of the female experience of child-to-adult transformation is the key to it all.
Boys don't experience that obviously, thus they're both not forced to accept an inexorable, biological drive taking place beyond the ego/self as girls are.
Girls/women have to face it at an emotionally, shockingly early time of development - it's a trauma, it's burdensome, it wrenches the child from childhood, yet it also allows them to face the future and the universe with an eternal, infinite, cosmically charged sense of the world-weary yet fatalistically pragmatic.
Boys don't have that honour.
Or power.
Boys/men conjure up their sense of power through genetically predetermined factors and - more haplessly - through a sense that they control their s*xual/procreative identities.
Men do not control it.
Instead, many men blame women for having power over them simply by being one half of the inevitable procreative plug-socket dynamic.
I have more opinions.
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