Whenever I hear about a bastard child, it’s always a son. In both history and fiction, I can’t think of a single instance of a woman born out of wedlock being referred to as a bastard. Why are all the bastards men? Where are all the bastardesses?
i think historically being a bastard would be brought up in questions of legitimacy of heirs, where it would be extremely easy to discredit a woman as an heir unless there was no other possible heir and she was unquestionably eligible to be the heir.