Thomas Jefferson never slept with Sally hemmings. This despite the fact she was the half sister of his wife who died and apparently looked just like her. But she was half black. And therefore a slave. The rumor of him sleeping with her was started by his political opponents for the presidency when Thomas Jefferson was running for the presidency. They called him a n lover and suggested he had slept with Sally hemings to insult him. The genetic testing that has been done showing the Jefferson genes in descendants of Sally hemings came from Thomas Jefferson's sons who did sleep with her. As with many famous men their sons turn out to be Creighton's and idiots like Hunter Biden. This was the case with Thomas Jefferson's sons. However Thomas Jefferson himself never slept with Sally hemmings and he even wrote in his journals he couldn't stand the smell of black people which he thought smelled like urine and he believed was because their bodies had evolved in Africa to not allow any moisture to come out of their skin therefore they had a strong more pungent urine smell which he did not like.