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I don't know about you, but when trying to figure out if someone is female by sight alone, long hair is a big clue, after clothing and before facial characteristics. Visual analysis can only reveal surface characteristics that are subject to manipulation (up to and including hormone therapy and plastic surgery), not "intrinsic", whatever that means.

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What is your point though? Who cares how it does it? The fact that it can tell gay from straight will have privacy implications for both. Not to mention that it is not revealed in the study how much of the feature set was based on grooming. This is pure speculation. Clearly these trigger points mean more minuses for me and a lack of any sensible discussion of the actual point of the study.

My point is that the poster I was responding to seemed to want something magical, something I don't think is possible.

But then again, it's trivial to fool it, if the deciding fitting factor is long hair.

Sure. And it's trivial to fool humans if they aren't able to look closely.

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