'Unnatural' in the Bible

And you may not have sex relations with a beast, making yourself unclean with it; and a woman may not give herself to a beast: it is an unnatural act.

And if a man has sex relations with his son's wife, the two of them are to be put to death: it is unnatural; their blood will be on them.

For any man whose body is damaged may not come near: one who is blind, or has not the use of his legs, or one who has a broken nose or any unnatural growth,