Dr Finklestien's Strange Acrophobia Cure

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Herbert was dressed like a fly, and thinking like a fly, and was even finding himself strangely attracted to human faeces, but there was no way he could bring himself to jump. 
"You must assume the very mind and habits of the fly." The good Doctor had repeatedly implored, "Have you ever seen a fly that is scared of heights?" 
"Well....." Thought Herbert. "There's always a first...."
His fear was desperately debilitating. How on earth was he to have conjugal relations with the delightful Geraldine if he was unable to climb up to the bed, and what would she be thinking? That he was actually afraid of the succulent fullness of her naked form? It was either jump now or remain a virgin forever!