"When a man takes a wife and is intimate with her"—Deuteronomy 24:1.
It is a mitzvah for a man to marry a woman through kiddushin. Kiddushin is accomplished through one of three methods: a) The man giving the woman an object of value [for the purpose of marriage]. b) The man giving the woman a marriage contract [a document upon which is written, "With this document I am marrying you"]. c) Through the man being intimate with the woman.
