When a person has copious amounts of anal sex, that a seperate cavity is formed within the rectum.
Over time faeces build up in this cavity until it cannot hold the pressure any more, similar to a dam break. The coming
catastrophe causes an implosion, in which the person is sucked into a vortex until they are one tiny poo particle. This shit molecule has the density of dark matter. A
phenomenon in which only 1 in every 1,672,200 anal sex havers experience.