This sign begs so many questions that I had to photograph it.
But first some explanations: A Friend of Dorothy is defined by Wikipedia thus
In gay slang a Friend of Dorothy is the term for a gay man.
The term dates back to a time in the early 20th century when homosexuality was against the law in both the United Kingdom and in the United States. Saying at a social gathering that another man was a "friend of Dorothy" was a way of discussing sexual orientation without other people knowing what you were discussing. The term has been linked to the film The Wizard of Oz starring Judy Garland as the main character Dorothy, which is almost certainly the source of the term.
Lush, the company responsible for the A sign in question, is a shop that sells 'handmade', rather ugly looking, rough hewn bars of soap.
Until I saw this sign I had always presumed that washing was an activity that could be indulged in without reference to ones own sexual identity. Are they suggesting that gays are dirty and thus in need of soap or perhaps they mean that heterosexuals do not wash and thus have no use or need of soap?