I had a similar experience once.

Exactly the same question as I was driving along the Corniche in Abu Dhabi.

I tried to explain it all very matter of factly (perhaps a little rushed). It was met with silence and then: ‘Oh, look at the pretty lights…’

My son tells me that in their sex education at school (he’s 10) they have a cartoon of people ‘doing it’. At one point, the voice over says ’sometimes the penis can get hard, and often it feels nice’. (I’d hate to be a teacher in there with all the kids!) Anyhow, my son’s friend leaned over and said ‘No it doesn’t, it hurts!’..

Um….