This is a great thread! I also knew about sex and periods way before my mum told me (Judy Blume I think) so I’ve tried to just make periods especially part of life for my girls so I don’t really need to tell them as such.
They know they periods are monthly bleeds, that you use a tampon to catch the blood and that the blood is an egg being released that could make a baby. They know that tampons go into your
tina, and they know the
tina is inside their Minnie (cute word we use for pubis) as I hate it when woman don’t seem to know where their
tina is.
sexwise, they’re too young to understand genuinely (I’ve tried!) so we go with mummy and daddy do a magic cuddle. They also know that a gay couple can have a baby by going to a doctor to help them.
they do think babies can come out of your tummy or your
tina, which is From reading this thread I now think is potentially abit confusing because it sounds like it’s a choice

but I’ve had 2 c sections so had to explain to my eldest what had happened when the youngest was born.
i think the bigger challenge will be telling them about consent/ respectful relationships and enjoying sex.
I started my periods very late (16 I think) so knew exactly what was going on by then