lay on belly (be descriptive!)
straighten arms and legs
cross wrists in small of back
cross ankles
press right cheek to floor
lower eyes
**all crossings are right over left
(allows for binding wrists/ankles)
Explorers of Gor, page 77 and Mercenaries of Gor, page 145

This position is used for a variety of reasons, sometimes as punishment.

Book 21, page 145
A binding position. The slave lays on her belly, her head turned as she presses her left cheek against the tiles. Her legs are straight out behind her she crosses her ankles, placing her hands at the small of her back, crossing her wrists.

Book 13, page 77
"Bara, Kajira!" he said. She rolled quickly to her stomach, placing her wrists behind her, crossed, and crossing her ankles, ready to be bound.

Book 11, page 125
"Standard binding position," he said. I was prone. When a girl is prone, the standard binding position is to cross the wrists behind the back and to cross the ankles. I took this position instantaneously."