The name pretty much speaks for itself. “The Viennese Oyster requires she place both of her ankles behind her head, fully exposing her vulva and folding her body into the shape of an oyster,” says sexpert Tyomi Morgan, who hosts a weekly video tutorial on educating people about positions. He holds her ankles in place, says Morgan, while she uses her free hands to prevent his body weight from crushing her contorted body. This is great for extra deep penetration.