Can't see a problem with two consenting adults doing what they want.
In terms of children, you open up a complete minefield when you start talking about birth defects. If you don't allow siblings to have children because of potential problems, do you allow disabled people or even those with harmful genetic traits that are passed down to have kids? I wouldn't hold a position either way.
In terms of children, you open up a complete minefield when you start talking about birth defects. If you don't allow siblings to have children because of potential problems, do you allow disabled people or even those with harmful genetic traits that are passed down to have kids? I wouldn't hold a position either way.