 The kiss of peace was an apostolic custom, and continues to be one of the rites in the Eucharistic services of Roman Catholics.In the Roman Catholic Order of Mass, the bishop or priest celebrant bows and kisses the altar, reverencing it, upon arriving at the altar during the entrance procession before Mass and upon leaving at the recessional at the closing of Mass; if a deacon is assisting, he bows low before the altar but does not kiss it.Among primitive cultures it was usual to throw kisses to the sun and to the moon, as well as to the images of the gods.