Medieval sexual monster myths resurface nearly unchanged in modern film

Evidence

Xerxes is not deformed like Ephialtes, but his size and preference for men and boys, in the words of Ephraim Lytle, “qualifies him for special freakhood.” The fact that he is a giant also suggests an element of sexual monstrosity that is quite evident—Xerxes possesses monstrous sexual organs. Xerxes reflects the medieval tale of Muslims with penises as large as trees entering heaven, requiring a small army of Jews and Christians to assist them. — Sophia Rose Arjana, Muslims in the Western Imagination, 678

Categorization

• QUESTION: The medieval myth of Muslim penises ‘as large as trees’ entering heaven needing Jews and Christians to assist — this is a specific source worth tracking down in medieval theology/polemics; where exactly does it originate?
• XREF: Connects to the reader’s core thesis that the monstrous Muslim body in the Western imagination is a projection of displaced anxiety — here specifically sexual anxiety.