traditionally. among adam's children, the one born in the mornin would have sex with the one born in the evernin{yea, it says that eve had a LOT of children, one every mornin and one every evenin} but there was one born in the mornin who wanted the girl born the next mornin which was rightfully of the guy born THAT evenin, n the two brothers fought and the first killed the second, thas how mankind's first WAR was fought. 😮💨