From the book:
"Its voice, unlike that of its companion, was light and breathy-the voice of an excited girl. Every inch of its head had been tattooed with an intricate grid, and at every intersection of horizontal and vertical axes a jeweled pin driven through to the bone. Its tongue was similarly decorated."
"Frank had difficulty guessing the speaker's gender with any certainty. Its clothes, some of which were sewn to and through its skin, hid its private parts, and there was nothing in the dregs of its voice, or in its willfully disfigured features that offered the least clue. When it spoke, the hooks that transfixed the flaps of its eyes and were wed, by an intricate system of chains passed through flesh and bone alike, to similar hooks through the lower lip, were teased by the motion, exposing the glistening meat beneath."
Doug Bradley , and especially his voice, are decidely male in every way IMO.