A childhood belief about reproduction

I remember when I was little I was playing with some Barbie dolls. I had some little plastic babies and I thought they were awesome : ] - Until I was talking to my friend while we were playing, she said that the babies should have sex and at which moment she made them kiss. I thought that sex was kissing and so when her mum arrived to take her home I shouted out the door "Remember, the babies have sex!" My mum slammed the door and seemed angry, I burst into tears and ran upstairs. When I started to do sex ed at school, I was really interested.... Until I brought home something my friend had done about girls having wet dreams, my mum looked through my school bag and found it... Then she explained everything.
I've not been into a single sex ed lesson since.