The Catholic Church teaches that situations where sex occurs outside of marriage "offend against the dignity of marriage; they destroy the very idea of the family; they weaken the sense of fidelity. They are contrary to the moral law. The sexual act must take place exclusively within marriage. Outside of marriage it always constitutes a grave sin and excludes one from sacramental communion." Many people in a sexual relationship believe that they are acting responsibly, even though they are not married. In certain situations there are some Christians who agree with them. What matters, they argue, is the quality of the relationship between two people, not whether they are actually married. If they love each other, and intend to set up a home together, then sexual intercourse is perfectly acceptable. Sex is a God-given activity which demands total commitment and trust if it is to be really meaningful. For this to happen, both partners must feel totally secure and such security can only be found within a marriage. Sex should never be used by a person simply to satisfy his or her ow
• In 1969, 21% of young adults said premarital sex was acceptable.