The ape is an unusual sex position that requires balance and strength. To get into the ape, the man lies on his back and brings his knees as far up to his chest as he can. He may also need to tuck his erect penis between his legs, so he can penetrate the woman as she faces away and sits down on him. At that point, the woman can plant her feet on the floor and lean back to support her back against her partner's feet.