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For the same reason that when a bunch of females live together, they get their periods synchronized... aka mating season for a flock, and males feel the need to fight with each other over who's cock is bigger, who's house is larger, who's gf is hotter... aka who's the alpha male:
We are still animals no matter how refined our communication and technology might be.
Females will feel more inclined to be attracted to a male who has a partner because it "means" that he's fit for reproduction (in animal terms)
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