It was an incorrect judgment based upon the idea of predominance of men over women and, as he did not have many children with a number of ladies other than Kodaiin (if we count a child during the age of Nagahama-jo Castle as really existing, there must have been two boys and a girl who died very young before Hideyori.), we should consider that Hideyoshi's physical conditions were the causes why he did not have many children.
これは男尊女卑に基づく陋習であり、高台院以外の多くの女性との間にも子ができにくかった（長浜城時代の子を事実として含めれば、夭折した男児二人、女児一人が秀頼の前にいたことになる）ことから、やはり秀吉自身が子ができない（できにくい）体質であったと考えるべきだろう。