This is the infamous sex position introduced to the world by Luke Holland. It is when a man throws his partner (man or woman) on to a near by surface, allowing him to gain a dominant stance over them. He then proceeds to take his
testicles out and slips them into the partner's anus, one at a time. At this point the anus almost becomes a vacuum, sucking the balls
deep inside. Keep in mind only the
testicles enter the rectum. It is very satisfying to both participants.