According to the bible Adam and Eve are the first humans on earth. Then they have children and their children have children. This is definitely incestuous behavior is it not? If man kind was started this way why is it something we frown upon today? Laws prohibit marriage of sister and brother or cousins when without this the human race would not exist. Why dont we celebrate this instead of shun it? I mean if it wasnt for incest none of us would be here today right?