My good friend, Fr Stephen Boyle, is parish priest of the Good Shepherd Church in New Addington. Last Sunday he published a pastoral letter for his parishioners on the subject "Sex is for family in a state of loving" - the "state" of loving being marriage, of course. He gives a sympathetic, encouraging and well-argued account of the Church's teaching on marriage, the marriage act, contraception, chastity and related topics. The context is his prayer for the Confirmation candidates that they may bear that fruit of the Holy Spirit which is chastity.
Read the pastoral letter here.