there is a niche for female-focused porn as porn has proliferated but it has grown negligibly compared fucked up shit pertaining to violence, rape, incest, etc. the world, essentially, is becoming japan.
now that said, relative to the original post, regulation was staunch in japan and remains that way. hence the blurred genitals during penetration and all that, and also hence all the super weird ass shit they animate as a workaround. in repressing conventional porn after WW2, they created the forebearer of much more twisted shit.
And you will know MY JACKET IS GOLD when I lay my vengeance upon thee.