I doubt very much if Nelson had "Syph", or anything like it. He was, after all , devoted to and potty about Emma, Lady Hamilton, and prior to his relationship with her ,he had been , one assumes, faithful to his wife, Fanny ( I think that was her name ? ) .....Anyway, you tended, in those days, not to become an Admiral AND get elevated to the peerage,if your todger was dropping off. He was far too busy climbing the social and professional ladders to have risked everything on the 19th century equivalent of a " Nee Soon Virgin ". ( Explanation supplied if required !! ). Hitler, yes .......Nelson, no.