In TOB for Beginners, Christopher West says that “every time a husband and wife have intercourse they are meant to renew their wedding vows with the ‘language of their bodies.’” So would they receive sanctifying grace from that act, or just from the initial ceremony?
With the sacraments that we receive only once such as Baptism, Confirmation, Holy Orders and Matrimony, so long as one is in the state of grace, one can receive sanctifying grace from those sacraments in an on-going way. Certainly, the renewal of wedding vows whether verbally or otherwise would be an occasion for receiving such grace.
Fr. Vincent Serpa, O.P.