Responses
Alright, now I'm confused.
Incest is considered unacceptable for two reasons: biological and moral.
Biological, identical genes, does not play a role in same-sex relationships.
What remains is moral, and for it it doesn’t matter whether they are related by blood or not, what matters is whether they are family or not.
But if we look only if they are related by blood, then it turns out that for same-sex relationships the concept of incest does not make sense.
Do people even know the difference between blood related and non blood related.
It would only be an incest if the other person is half blood or literal blood related something.
Also Step sister and half sister are not the same