The original Harlequin novel

Heavy words lightly thrown is a new book produced by a London university librarian which exposes the seamy and laviscious history behind many children's nursery rhymes.

While people already know that Ring a Ring o' Roses refers to the rash displayed by sufferers at the time of the Great Plague, it is less well known that Oranges and Lemons, a guide to the City of London, doubles as a lewd wedding song, [said the author].

Oooh. And there's much more to delight and captivate you. Here's a link to the publisher and some extracts.