Homoerotic poetry is a genre of poetry implicitly dealing with same-sex romantic or sexual interaction. The male-male erotic tradition encompasses poems by major poets such as Abu Nuwas, Michelangelo, Walt Whitman, Federico García Lorca, W. H. Auden, Fernando Pessoa and Allen Ginsberg. In the female-female tradition, authors may include those such as Sappho, "Michael Field", "Marie-Madeleine" and Maureen Duffy. Other poets wrote poems and letters with homoerotic overtones toward individuals, such as Emily Dickinson to her sister-in-law Susan Huntington Gilbert.