@Macaroni46
“My grandmother used to be appalled that I washed my hair whilst on my period. I'm not sure what she thought might happen! She used to mutter about it causing a disturbance in my circulation 🤷♀️“
There’s something similar in my teen experience. My mother was a mean sort and, in the 90s, she used to comment that girls in my school with greasy hair must be on their period, hence them being mean. I never understood why. Thought maybe she was just saying this to fob me off, not wanting to engage with my various friendship problems at school. But, seeing your post, I wonder if she maybe believed that on some level (as well as being horrible).
I also distinctly remember a female history teacher, probably somewhere around age 13, talking about life in Elizabeth I times and commenting off-hand: “can you imagine having your period and not washing?”. I was like “whaaaaat?” since I assumed my mother thought that was the norm.
As it happens I was very late getting my period and never didn’t shower.
It’s so interesting to see all these whispered period myths out in the light, so to speak.
(Sorry OP for detailing the thread a bit.)