The Spider Monkey sex position is a very complicated position that calls on the partners to face away from one another.
To get into this position, the penetrating partner stands on their toes with their feet shoulder width apart. The receptive partner stands on their head with their arms bent at the elbows and forearms on the ground. The receptive partner bends their knees and spreads their legs on either side of the penetrating partner who supports them by holding onto their feet.