The woman sits cross-legged. The man topples her forward and penetrates her from behind.
Origin of the name
Zazen is the root discipline of Zen — legs folded, spine tall, mind stilled. This position takes that seat of perfect stillness and tips it gently forward, cross-legged and all; the irreverence is the joke, and it glints with the wit of the Edo period's (1603–1868) playful namers. Upending something solemn places it in the same lineage as Butsudangaeshi, the 'altar-tipper'.
Tips
She stays cross-legged and folds forward, supported on her arms and a cushion. Guide her down slowly with a hand — never a push. The fold loads the hips and knees, so a loose cross is fine, and undo it at the first sign of strain.
The angle runs deep: start shallow and read her. Keep your weight off her back, and never press on the head or neck.
