It started with ships. Sailors would refer to their boats as “she” because of how much they loved and cared for their boats. Maintaining a boat is a lot of work, so it was compaired to maintaining a relationship with your spouse.
There was also a trend where sailors would name their ships after important women in their lives as a way to honour them. Sailors could spend weeks or months away from their families and friends, and there was no guarantee that they would return home.
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