In Renaissance Florence, a number of designated boxes placed throughout the city allowed citizens to make anonymous denunciations of various moral crimes—in , for example, the artist-monk Filippo Lippi was accused of fathering a child with a nun. But the crime that the government was really trying to control was sodomy, so notoriously prevalent that contemporary German slang for a homosexual was Florenzer. The common nature of the offense did not erase the threat of serious consequences. There is little doubt that Leonardo was arrested. Although any time he may have spent in jail was brief, and the case was dismissed, two months later, for lack of corroborating witnesses, he had plenty of time to ponder the possible legal punishments: a large fine, public humiliation, exile, burning at the stake. Private notebooks of all sizes, some carried about for quick sketches and on-the-spot observations, others used for long-term, exacting studies in geology, botany, and human anatomy, to specify just a few of the areas in which he posed fundamental questions, and reached answers that were often hundreds of years ahead of his time.
Mona Lisa smile 'based on Leonardo da Vinci's gay lover', claims art historian
Biography of Leonardo da Vinci, Renaissance Man
Leonardo was born out of wedlock to a notary, Piero da Vinci, and a peasant woman, Caterina, in Vinci , in the region of Florence , Italy. Leonardo was educated in the studio of the renowned Italian painter Andrea del Verrocchio. Much of his earlier working life was spent in the service of Ludovico il Moro in Milan, and he later worked in Rome , Bologna and Venice. He spent his last three years in France, where he died in Although he had no formal academic training,  many historians and scholars regard Leonardo as the prime exemplar of the "Renaissance Man" or "Universal Genius", an individual of "unquenchable curiosity" and "feverishly inventive imagination.
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When he was twenty-four years old, Leonardo was arrested, along with several young companions, on the charge of sodomy. No witnesses appeared against them and eventually the charges were dropped. It must be said that often anonymous charges like this were brought against people just for a nuisance.
Skeptics Stack Exchange is a question and answer site for scientific skepticism. It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. I have heard it a lot and read somewhere that he was homosexual like one of answers under the same question here :. It's rather possible.