6 And while this perfect chastity is the subject of one of the three vows which constitute the religious state, and is also required by the Latin Church of clerics in major orders and demanded from members of Secular Institutes, it also flourishes among many who are lay people in the full sense: men and women who are not constituted in a public state of perfection and yet by private promise or vow completely abstain from marriage and sexual pleasures, in order to serve their neighbor more freely and to be united with God more easily and more closely.
Source: Sacra Virginitas (Vatican.va)