This has prompted me to remember a lesson with an adult student a few years ago. We were talking about the dangers of the advertsing industry, and studying a photograph of a painfully thin fashion model on a catwalk.

The discussion swung round to the thorny problem of anorexia. But as she was having problems with pronunciation she did not say, ''Anorexia causes many problems'', but instead she informed me in a solemn tone that '' Erections cause many problems''. That was just about the end of that lesson:)