McBell
Unbound
It is simply because he has an issue with family members getting it on with each other.Then you must also have an issue with ANY sex that can create a child with a risk of birth defects.
Now, what I am asking you is this: Assuming that it were possible to ensure that incestuous sex never resulted in a pregnancy, would you still have a problem with such sex? If so, why?
When you come in here and start saying that since we can't 100% make sure that pregnancy will never happen, and your resulting refusal to leave that particular issue alone is exactly what I was talking about back in post 628.
The whole genetic argument is merely a smoke screen for his "yuck" factor.