From YOUCAT, page 221:
406: Does everybody have to be chaste, even married people?
Yes, every Christian should be loving and chaste, whether he is young or old, lives alone or is married. [2348-2349, 2394]
Not everyone is called to marriage, but everyone is called to love. We are destined to give our lives aay; many do so in the form of marriage, others in the form of voluntary celibacy for the sake of the kingdom of heaven, others by living alone and yet being there for others. All human life finds its meaning in love. To be chaste means to love with an undivided heart. The unchaste person is torn and not free. Someone who loves authentically is free, strong and good; he can devote himself in love. Thus Christ, who gave himself completely to his Father in heaven, is a model of CHASTITY, because he is the original model of strong love.