Here’s my take on it. In chapter 12 of Leviticus we know that ancient peoples saw “anything to do with reproduction as being very mysterious” and that “sexual irregularities were regarded as impure and obscene”. Israel was no different in this case. But “in Israel a high ethical and moral sense in things sexual was developed”. Males could not have any contact with a woman when in active service. In the case of 1 Sam 21:5-7, it was regarded that wars against pagans were something holy and an “unclean man could not fight in the holy name of God”. By our standards that seems a bit strange, try telling that to the people of that time. These people honestly believed this. Of course, if one reads Leviticus superficially, one could get the impression that this is one difficult book to understand. You could say, “what does this have to do with me”. If you go beneath the surface a little more and see the unique perspective this book contains, you will see that this book of Leviticus contains a religious meaning. All of Leviticus, beneath all the sacrifices or offerings it describes, lies a “deep conviction that God is the Lord of all creation”. “Man’s physical needs serve as recourse to God by means of rites and offerings that are in connection with the world in which he lives in”. Keep mind when your a nomadic person, sacrifices consisted of animals taken from the flock. Later on of course, when becoming tillers of the soil others were added on. The sacrificing of animals was considered the highest act of worship, which was one’s way of expressing to God his feelings in terms of adoration, recognition, gratitude and supplication.