I've been looking around the net a lot and searched the forum, but i could not find any complete explanation. My understanding of mating is that the male injects sperm with the penis into his hectocotylius and then uses the hectocotylius to put the sperm "inside the female" (directly inside the gonads? or if it is stored, how is this achieved and how the fertilization occours afterwards?) In the process, the hectocotylius may rupture and remain inside the female (or does this happen only to other cephalopods?) The question is double: 1. what actually causes the male to die after the mating? This seems particularly strange to me because i've read (http://en.wikipedia.org/wiki/Octopus#Physiology) they can survive months after mating. 2. Does this death give any reproductive advantage? In the female case, this is clear, yet i can't get what's worth the sacrifice of a healthy male that i would expect being able to mate again. If this is just a flaw, i would have expected evolution to fix this disadvantage in a quite ancent, successful, varied and spreaded group. Any clues?