I think the Saint Andrew's cross enjoys tremendous popularity because it fits the human body and offers a versatile anchor point for bondage. The arms of the X naturally align with the arms and legs, and the center point of the X is usually near the torso. The St. Andrew's cross provides a very stable base for securing a bottom for flogging, spanking, cock and ball torture, nipple torture, and anything else you want to do to a bottom while he or she is bound.