I'm not familiar with this specific case, but sometimes a trait can become fixed in a population in a random process. That is, a random preference might become fixed also in a random manner. It is called Fisher's Runaway Process https://en.m.wikipedia.org/wiki/Fisherian_runaway …
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If the aggressiveness gene was in a non-sex-chromosome, and also linked to the appearance (white stripes, or tanned), then it can be possible that the preference developed irrespective of gender. But again, I'm not familiar with this specific species
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