"Moral decisions (including sexual ones) do not invoke a specific 'moral sense' in the brain. They rely on a brain mechanism that influences all choices: our reward circuitry."
Okay, this smacks just a bit of a false dichotomy. Why not a specific moral sense which does exist in its own right but, at the same time, is substantially affected by other neurological mechanisms? I know from personal experience with brain cancer that there is a moral sense which signals me with gnosis of good and evil. For quite some time my moral sense was almost completely muddled, but that wasn't mutually exclusive with my faculties of logic, judgement, initiation, inhibition, etc., being seriously screwed up, too. For example, after my recent craniotomy not only did my moral signal get unjammed, my writer's block totally melted away. There's clearly much overlap between neuro-circuits and I don't see why that should be surprising in the least. This surely doesn't mean there is no such thing as moral circuitry in particular. Who ever said that what we know as the conscience is completely compartmentalized and independent anyway? Are you responding to anyone in particular with this point?
Let me put it this way: right before my recent craniotomy, my brain was being flooded with sick desires but my moral judgement was so impaired I didn't even think of them as sick. Right AFTER my recent craniotomy I immediately understood that they are sick. And evil. Just a coincidence? I don't think so.
I'd say the desire for revenge virtually for the sake of revenge (actually, for the dark pleasure of it in many cases!) is another huge example showing the primitive underbelly of moral circuitry which can become very addictive and counterproductive.
Anyway, thank you so much for the thought provoking articles! <3