From https://artincontext.org/the-cursed-woman-painting-by-tassaert/

The title can possibly refer to prejudices related to women and their open sexuality during the 1800s; in other words, a woman so open and free is “damned” because she is not chaste or coy.

Yeah, just puritan bullshit. Appeal to male insecurity, too, at least the types that get upset at the idea of a woman having been touched by another man. And then those negative feelings get protected onto the woman, of course.