Raymond - you´ve got a point. On the other hand, if the rapist or rapists, took the trouble of masking themselves, the victim would certainly know that the evil deed was planned - that they intended to attack and rape her. Not a comforting thought, I´d guess. I think that a mask adds an element of fear on the victim´s behalf.
Personally, I´m a big fan of stocking masks, particularly knee highs, that keep a tight fit around my head. Ski masks would work OK too. Any masked people out there? Any masked female helpers? I would love to hear from you.