How many stroke cases exist that resulted in a change of sexuality for the stroke sufferer?

I recently read up on the story of Chris Birch who claims his stoke changed his sexuality. He stopped liking women, turned gay, and started dating men in complete contrast to his life before his stroke. I was wondering how often does this happen in stroke cases and how documented this is in the stroke literature. Are there any other known cases of this or is Chris Birch a unique case?

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