If she is married — any man. If she is single — her nephew, her brother-in-law etc., for sure. If she is a niddah and single (and all our single women, generally, are niddos), any man is an erva to her. But about this last thing I am not sure, if there is an issur of hirhur. Shulchan Aruch, however, forbids reading dirty books as it brings yetser hora on a person.
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