Well, for what it's worth, I learned recently that in many octopus species, the male's sex organ is on its third right arm. ("Is this a state visit, or are you just glad to see me?")
It is ordinarily sacrificed upon use, and the cephalopod is out of action in that regard until next season, when a new one grows.
It also seems that most octopus have distributed processing, with a subordinate brain to control each arm. (Well, all the arms are - complicated.)
In one species, regarding mating, the male, remaining discretely at a distance, has the arm detach and it goes a-calling autonomously. (Target designation is evidently done in advance - the arm isn't given carte blanche, so to speak.)