SIR ISAAC NEWTON  FACTS 

Newton never married. Although it is impossible to verify, it is commonly believed that he died a virgin, as has been commented on by such figures as mathematician Charles Hutton,^[86] economist John Maynard Keynes,^[87] and physicist Carl Sagan.^[88]
French writer and philosopher Voltaire, who was in London at the time of Newton's funeral, claimed to have verified the fact, writing that "I have had that confirmed by the doctor and the surgeon who were with him when he died".^[89] In 1733, Voltaire publicly stated that Newton "had neither passion nor weakness; he never went near any woman".^[90][91]
Newton did have a close friendship with the Swiss mathematician Nicolas Fatio de Duillier, whom he met in London around 1690.^[92] Their friendship came to an unexplained end in 1693. Some of their correspondence has survived.^[93][94]
Newton was one of many people who lost heavily when the South Sea Company collapsed. Their most significant trade was slaves and according to his niece, he lost around £20,000.