Very long story short, I was talking some time ago with a SLE guy who is in medical profession and he was doing an interesting thing: he was trying to connect the types to specific biochemical imbalances in the brain to try to predict which medication would work best for his patients. This has intrigued me but I my memory of various neurotransmitters and biochemical pathways was extremely rusty so I couldn't easily check what he was saying.
But eventually that go me wondering, what if duality partners are attracted to each other because both of their brain biochemistries are unbalanced exactly in a way that if genetically combined has greatest probability to produce mentally healthy children? Essentially if I am missing some receptors A and my dual parter has overabundance of some neurotransmitter B then combination of our genes together is more likely to lead to making a child who is low on receptor A but has enough of neurotransmitter B to make up for it.
I know this is a far fetch but those of you who have observed children of dual couples as opposed to children of two IxxP or two ExxP parents, have you noticed anything of the sort, that they tend to be better off and have less health and behavioral problems?