Son (11) has just come home from junior school.
In a very matter-of-fact and disgusted tone, having complained about this, that and the other, he said:
"Oh and I had to have sex education today. I have to have it all bloody week. Teacher was just going over all the real names for things and one of the girls asked 'why do the boys have to learn about us?' and the teacher said 'good question!' and went on for another bloody half an hour. So now I have all these mental images at lunchtime and my cheese and peanut butter sandwiches were tasting weirder and weirder."
Poor little sod, although perhaps the expectation of the tang of cheese and peanut butter will slow his development at some crucial point later on. A mother can only hope.