It is more than the feeling of being anally penetrated. It is the presence of a man controlling you from behind, using his cock to find pleasure deep inside of you, while you do the same inside of a woman. There is the rhythm, the pressing into each other, the moans and quick gasps, the feeling of being in the center of something wonderful and full. The feeling of coupling with two people at once, and the release. The release of sperm into your bowels and the shooting of sperm into a fertile pussy, the orgasms and the fluids dripping. There are so many incredible feelings that it just has to be experienced.