My uncle took me on a train journey once, he bought me some sweets and said I could have them once we were on the train. I was around 4-5 and had been in the playground and somehow picked up that “have sex” meant giving someone a cuddle. We get on the train and I ask if I could have my sweets yet. My uncle said no because we were stood up, and he said once we got to the next stop people would get off, we could sit down and then I’d be able to open my sweets. Being a little madam, I loudly declared that if he didn’t let me have my sweets I wouldn’t let him have sex with me (ie, I wouldn’t give him a cuddle). He said the entire carriage looked like they wanted to lynch him and he wanted to die then and there. It was only when we got to our destination he had my Mum ask me what I’d meant and they figured out what I’d learned in the playground!