Geez the condescension in some parts of this thread is what's shocking!
I'm an ex hcp and have done loads of catheterizations, vaginal swabs etc
Not everyone's nerve sensations are the same
Some women's urethra opening is very close to their vaginal opening which adds to the nerve sensations getting confused
In addition there's cultural/generational issues
My mother (catholic) didn't know when she got married how babies were made. She also thought tampons were sinful and removed your virginity! She certainly wouldn't have explored or looked at herself! She's only late 60's
I'm only early 40's and when I was at school boys and girls were given sex ed separately and only given the basic info relating to their sex. And it was still legal for parents to withdraw children from sex ed on religious/moral grounds.
My ex is same age as me and went to an all boys school he had no clue beyond basic baby making how women's bodies worked. I had to teach him about 3 holes, clitoris, periods (he knew women bled and that it was something to do with reproduction, he didn't know it was monthly, how hormones worked, that there was more than one hormone involved, that it hurt! That it was used to date pregnancy, let alone how that worked!), he'd no clue on bf either re hormones etc, knew nothing about pregnancy beyond it lasted 9 months and the widely discussed symptoms (morning sickness, bigger boobs), didn't know why periods stopped when pregnant, didn't know about the many other pregnancy symptoms (heartburn, piles etc).
But then he'd no clue about his own body either! Not just sex stuff, he took a bad bout of constipation once after a lads weekend, didn't have a clue if was because he'd been drinking loads, eating crap and no fibre for 4 days. He didn't know about vitamins effect on bodies etc etc
And for my generation he's not that unusual in my experience.
I've met pregnant women who don't know that's why they've had no period for 2 months. Many adults who don't understand nutrition or basic healthy living.
I'm shocked at our poor education in this country but not shocked there are people who don't know this stuff.