London used to have Gropecunt Lane, but that was a precise description, not a double entendre.
Cumbria has the town of Cockermouth. It's said that in pre-postcode days a letter addressed to something like 24 High Street, Fellatio, Cumberland was correctly delivered.
In the Camargue in the South of France there is a channel called "Trou de mon Oncle" (my uncle's hole). |