There is a marsupial that literally fucks itself to death!! It has Marathon sex until it goes blind and drops dead. Meet the Antechinus, a rodent like marsupial discovered not so long ago.
During the mating season the male antechinus sprints around mating almost non-stop for an exhausting three weeks, with single romps lasting as long as 14 straight hours. ALL the male antechinus die en masse at the end of each mating season, after vigorous and sustained sexual encounters causes their bodies to disintegrate from stress. Yes, all the male antechinus die and only the females remain.