Sex efficiency through exercises : special physical culture for women / by Th. H. van de Velde ; [photos, by E. Steinemann].
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! FILM 1. LEG ROTA - T I O N IN HANDS-AND- KNEES ATTI- TUDE {Begin- ning of Sixth Phase). The right leg is rotated slowly outwards as the hip joint is raised. FILM 2. PELVIC ROTA- T I O N IN THE HANDS- AND-KNEES ATTITUDE (Beginning of Fourth Phase). The pelvis is drawn down- wards and to the right.