18+ Siblings should legally be allowed to marry eachother in my opinion

If two twin sisters who are both 18 years old and they both want to marry eachother I think legally they should be allowed to do it because what they’re doing isn’t hurting anybody.

If a brother and a sister who are both consenting adults and they both want to marry eachother I think legally they should be allow to do it as long as the brother gets a vasectomy so that they do not have any kids together. Because what they’re doing isn’t hurting anybody.

I agree that incest is weird and gross which is why I personally would never do that but I don’t think that it’s morally wrong as long its between siblings that are both consenting adults and they do not have any kids together because what they’re doing is completely harmless and isn’t hurting anybody. So they deserve to have the right the right to marry eachother if they want to just like everyone else that isn’t related to their spouse.