You shall not commit adultery'. We are called to lead a chaste life, according to our particular state of life. Chastity is the successful control of our sexual desires. As a virtue it is associated with temperance. Chastity is not a negative thing, but a positive way of living friendship to the full, without using others to gratify our desires.
Chastity is expressed in celibacy or in the lifelong commitment of marriage.
We can be chaste through our own self-control and exercising the virtue of temperance which seeks to control our passions and the appetites of our senses through the use of our reason. We should seek the help of prayer and the sacraments if we find this difficult. The true and God-given purpose of our sexuality is to enhance the conjugal love of husband and wife in marriage so that their union will be fruitful and bring the new life of children into their lives. The sixth commandment forbids adultery, or marital infidelity, when someone who is married has sexual relations with a person to whom they are not married. It also forbids sexual acts outside marriage and all offences against chastity.