The great thing about science fiction is that we're not the first ones to have this discussion.
Lazarus Long's (female) clones, Lapus Lazuli and Lorelai Lee, used the "it's masturbation, not incest" argument on him at or around their eighteenth birthday. I don't think he bought it (especially since the fact remains that he raised them as his sisters/daughters), but it'd take a superhuman man to resist Laz and Lor, and he wasn't up to it.
Since the Cuckoos share not only a genotype but also a consciousness, however, the "it's masturbation" argument is probably more convincing in this case.
Obviously, it takes a lot for an incest pairing to squick me out, although of course it isn't impossible.
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Lazarus Long's (female) clones, Lapus Lazuli and Lorelai Lee, used the "it's masturbation, not incest" argument on him at or around their eighteenth birthday. I don't think he bought it (especially since the fact remains that he raised them as his sisters/daughters), but it'd take a superhuman man to resist Laz and Lor, and he wasn't up to it.
Since the Cuckoos share not only a genotype but also a consciousness, however, the "it's masturbation" argument is probably more convincing in this case.
Obviously, it takes a lot for an incest pairing to squick me out, although of course it isn't impossible.