21 There is yet another reason why souls desirous of a total consecration to the service of God and neighbor embrace the state of virginity. It is, as the holy Fathers have abundantly illustrated, the numerous advantages for advancement in spiritual life which derive from a complete renouncement of all sexual pleasure. It is not to be thought that such pleasure, when it arises from lawful marriage, is reprehensible in itself; on the contrary, the chaste use of marriage is ennobled and sanctified by a special sacrament, as the Fathers themselves have clearly remarked. Nevertheless, it must be equally admitted that as a consequence of the fall of Adam the lower faculties of human nature are no longer obedient to right reason, and may involve man in dishonorable actions. As the Angelic Doctor has it, the use of marriage "keeps the soul from full abandon to the service of God."
Source: Sacra Virginitas (Vatican.va)