Why do guys find periods gross?

Okay. Why do guys find periods gross? I mean, the blood from the menstrual cycle is what gave you life when you were in your mother's womb? The reason why a girl will skip her period when she's pregnant is because that blood went to the "baby". Why is it considered disgusting to you guys, you got period blood running in your veins, hello be thankful.
Why do guys find periods gross?
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