Answer:
Historians believe that he was gay due to the close relationships he had with his male pupils and mentors. Due to the fact that da Vinci worked so closely with the church and that he lived in a very puritanical society, it is believed that he was known to be homosexual in society but was not persecuted as he kept his private life secret.
What is known for certain is that he was charged with sodomy (along with three other young men) when he was young, but he was acquitted. Additionally, he never married despite being a well-respected genius and thus must have been a highly sought after bachelor. Plus, art historians believe the softness and androgyny of his male subjects is indicative of his sexuality. Finally, he spent most of his lifetime sharing living quarters with assistants or pupils who were, in some cases, known to be homosexual.
Yes he was believed to be homosexual but they are not really sure.
Yes! Da Vinci was, indeed, homosexual.
In fact, he had a 13-year lover at one point.