In 1978, Robert Swain divorced Nancy Swain because of her adultery. She did not deny it. In fact, she was living in an apartment with another man she intended to marry.
What Robert objected to was the order giving Nancy custody of their minor daughter. His position was that exposure to an adulterous relationship inevitably causes detriment to the morals and welfare of a child of impressionable years.
The Maryland Court of Special Appeals disagreed. It said there are no presumptions that adultery makes you an unfit parent. Adultery is relevant only as if it actually affects the child’s welfare. There is no presumption of harm. Adultery will not tip the balance against a parent in a custody case.
Swain v. Swain, 43 Md. App. 622; 406 A.2d 680 (1979)