dragging a few letters out of a 60-0dd year relationship into the conversation under the rubric of their being "flirtatious" in order to somehow defend TJ from the (probably) true charge that he was impregnating his slaves is intentionally misleading.
I would say it is fundamentally dishonest, but I don't know the guy that said it, and that's a pretty heavy charge.
I read the letters and found them flirtatious, on both their parts. He more than she.
His wife died when he was young. Sally was his wife’s half-sister. Do you really think the man went without sex for the rest of his life?