<P> A ménage à trois (French for "household of three") is a domestic arrangement in which three people having romantic or sexual relations with each other occupy the same household . It is a form of polyamory . </P> <P> History has a number of examples of ménages à trois relationships . One has to look no further than the King James Bible . The Book of Genesis introduces Lamech (descendant of Cain) who shares a ménages à trois relationship with Adah and Zillah .--Genesis 4: 19--24 </P> <P> Sir William Hamilton (British ambassador to Naples), his wife Emma Hamilton, and her lover, the naval hero Admiral Horatio Lord Nelson, were in a ménage à trois from 1799 until Nelson's death in 1805 . The German intellectual Dorothea von Rodde - Schlözer, her husband Mattheus Rodde and the French philosopher Charles de Villers also had a ménage à trois from 1794 until her husband's death in 1810 . At the age of 16, in 1813, the future author of Frankenstein, Mary Godwin, eloped with her to - be husband Percy Bysshe Shelley and engaged in a ménage with Claire Clairmont, future lover of Lord Byron, with whom the Shelleys would later have an extensive relationship . The writer Aldous Huxley and his first wife Maria engaged in a ménage with Mary Hutchinson, a friend of Clive Bell . The author E. Nesbit lived with her husband Hubert Bland and his mistress Alice Hoatson, and raised their children as her own . The actress Hattie Jacques lived with her husband John Le Mesurier and her lover John Schofield . The political philosopher Friedrich Engels lived in a ménage à trois with his mistress Mary Burns and her sister Lizzie . </P>

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