Last modified on Fri 12 Feb 2021 12.35 EST The sensual American graffitist Cy Twombly, who lived in Italy from the late 1950s until his death in 2011, lushly inscribed his epic canvases with love poetry – Shelley and Keats, Cavafy and Catullus. The work was like an abstract expressionist Valentine’s card. He even used hearts and roses in his work, as well as penises, breasts, anuses and vaginas. But who was his Valentine? The answer is as epic and enigmatic as Twombly’s art. In the early 1950s he met a young artist called Robert Rauschenberg and they became lovers. On one occasion while...