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> Another reason is that it subverts the family unit. You won’t be able to have a healthy family relationship structure if you are banging your mom because by doing that you would be cucking your dad thus subverting his natural authority over you and his place as the man of the house which are both needed to raise healthy offspring. Nobody would respect a man who is being cucked by his son, taboo or not.
The idea of Incest is already bad on its own terms. It's better if the child (in this case, the son) should never have a sexual relationship with their parent (the mother) regardless of any reason to. Most parents treat their children morally. So the introduction of a sexual relationship is quite immoral, especially if they slap the fuck out of you and call you sick or something.
> After all, it is better to have casual sex with your mother or sister than it is to sleep with people you just met on a dating app in which you could catch various stds.
Fair point. If it's done correctly by using contraceptives (like condoms and stuff), then it's alright. Or if it's touching (masturbation, like you've already stated, nipple play, etc) that's fine. Just try not to impregnate your sister, mother or whoever, if it's a temporary sexual relationship (depends on your intentions).