It is important for the girl’s thigh to be held immobile

It is important for the girl’s thigh to be held immobile; sometimes it is held by more than one man; sometimes it is bound to a wagon wheel; sometimes, in the house of slavers, a heavy, vise-equipped metal branding rack is used. The girls are usually branded impersonally, perfunctorily, as cattle.

Tribesmen of Gor, p.64