How could a creature/species evolve erogenous zones in areas not usually sex-related?

For example, a half-cat half-human hybrid might have a zone partway down their tail, or a human might have one in an unusual place e.g. their scalp, shoulders, whatever.

I've seen this used in fiction before, but can't think of any way in which it could really be justified by ordinary biological/ecological circumstances (i.e. evolution).

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How could a creature/species evolve erogenous zones in areas not usually sex-related?

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