Pounding on the Spot
From - The Perfumed Garden of Sensual Delight
THIRTEENTH MANNER--Dok el arz (pounding on the spot). The man sits down with his legs stretched out; the woman then places herself astride on his thighs, crossing her legs behind the back of the man, and places her vulva opposite his member, which latter she guides into her vagina; she then places her arms round his neck, and he embraces her sides and waist, and helps her to rise and descend upon his verge. She must assist in his work.