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I honestly don't have any clue as to how daunting (or simple) that is, but I'd imagine that the sophistication of the systems would play a pretty key role.
Makes me wonder how much this has been researched in true hermaprhodites.
Their densities are actually pretty high, so I'd wager they encounter each other frequently, so I'm not sure where that leaves them in terms of pressures for hermaphroditism.
However, it doesn't eliminate the maintenance of two sets of reproductive systems.Inbreeding avoidance does not have to be the cause of the hermaphroditism persisting, if the environment/other factors favour hermaphroditism.I never said that both were simultaneously necessary.sort of like asking 'why do we bother getting married and buying houses when we could just hook up at a bar every weekend?' hermaphrodites can reproduce more easily, but other organisms invest more in their offspring and also often have a harder time getting around to mating. It is perhaps easiest to address the question by countering it and asking why dioecy (2 sex systems/2 gonochoric types e.g. As you have pointed out there are obvious advantages to being a hermaphroditic species such as more chance of mating - more likely to provide an advantage at very low population densities where interactions are infrequent.