 The Catholic Church teaches that human life and human sexuality are inseparable.Because Catholics believe God created human beings in his own image and likeness and that he found everything he created to be "very good," the Catholic Church teaches that human body and sex must likewise be good.In cases in which sexual expression is sought outside marriage, or in which the procreative function of sexual expression within marriage is deliberately frustrated (e.g., the use of artificial contraception), the Catholic Church expresses grave moral concern.