From the Washington Post:

Yes, she liked to read the Bible, but she devoured gothic romance novels, too.

The fact that so little is known about Martha and that she has been cast throughout American history as First Frump is, in part, her fault. In the days after George Washington died, she, as was the custom of well-known people of her time, burned all their correspondence. So we know George wrote two youthful love letters bursting with yearning and passion to Sally Fairfax, even though she was the wife of his good friend. We have a really bad poem he wrote as a teen to a young Virginia beauty (”Rays, you have, more transparent than the sun . . . “). We have no idea what he wrote to Martha.