It's because you need to make an active effort to look away, and not everyone has learned how to do that.
You can take the phrase "sexual attraction" quite literally. It seems to be more common for men than women, but when you see someone you find sexually attractive your eyes just fix onto it. It's like a magnet. You have been taught that it's rude, that's why you look away and stop staring. But the staring is automatic while the looking away requires a conscious decision.
Most guys learn to control it eventually but apparently not everyone.
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Give him the finger he'll stop
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