Are you saying that women shouldn't be allowed in pools whatsoever? What even is your argument?

Do you have any experience with heavy flows..? I change my pads every hour some days and I never ended up standing in red water. A ten minute shower uses up 75+ litres of water. She's only going to produce a couple of drops of blood during that time, no matter how heavy her flow is. Look at the size of a menstrual cup - even for women with heavy flows, that usually lasts hours and it's still far smaller than the water a shower will take.

If your girlfriend is actually bleeding so much the water is constantly red, that sounds more like a huge wound in her vagina/uterus that's bleeding out. Like if she's bleeding that much she's probably dead at this point. Rest in peace?

Do you get on your knees and lick up water from the floor of the shower? If you don't, your analogy is really dumb.