How could an organism chemically need sex?

Although (as far as I've seen, I haven't done in-depth research) the original/older version(s) of the succubus legend just have them as demons who seduce you, more modern interpretations seem to make them reliant on sex to survive.

Is it biologically possible for an organism to need sex to survive? And I don't just mean going mad without it/other mental health issues, I mean actually biochemically needing it for some reason.

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How could an organism chemically need sex?

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