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Blood changes the nutrients available in the "lady garden".
Bacteria and yeasts that live there do better or worse than the rest of the month when the blood comes.
The pH (the acidity) inside the vagina is dependent on the mix of bacteria that are doing well at that time.
Low pH = increased acidity.
The urethra is very sensitive to acid (makes it burn like a bastard), so a tiny decrease in pH can make a huge change in discomfort.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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