Fahim Ansari — accused of helping the jihadi gang who killed 173 in November — says the American performed a sex act on him against his will.
He claims this amounts to torture because he is a devout Muslim.
Ansari alleges the woman stripped him naked, abused him all night — leaving wounds and bite marks — and showed him hardcore porn films.
His lawyer, Ejaz Naqvi, has filed papers alleging the woman “sexually harassed him”.
A court in the Indian city ordered medical checks on “wounds on his private parts and all over his body.”
Ansari — a member of the Lashkar-e-Taiba terror group behind the Mumbai horror — was arrested with five other suspects last year.
Police sources said he had confessed to carrying out reconnaissance on 12 sites, including the Taj and Oberoi hotels where dozens were shot.