Certain kinds of sexual acts are intrinsically evil and are therefore always immoral, regardless of circumstances, intention, or purpose. Can a married woman use the contraceptive pill for a medical purpose, while refraining entirely from sexual relations? Let's examine some of these heretical claims. Therefore, passionate kissing and similar acts of affection between an unmarried man and woman are not necessarily objective mortal sin. By oral sex, I am referring to oral-genital contact between spouses. Thomas Aquinas wrote that marital relations is not moral during menstruation.
First, oral sex is not natural. But such conditions in no way affect the behavior essential to the human act, so knowing they exist does not prevent couples from engaging in human acts of sexual intercourse. If I hug my wife, does that mean I have to end up having sex with her? And there is no gravely immoral object in such acts, since all genital sexual acts are absent from mere kissing and similar limited expressions of affection and sensuality. But few if any priests have taken Knotz's explicit approach to sex — including everything from the theological to the practical, from oral sex to contraception and the number of children a Catholic couple should have.
The Catholic Message Board • View topic - The Church's views on Oral Sex/Foreplay
Nor can one claim that more than one sexual act is to be considered a single act because sexual climax occurs only after the other sexual act or acts. This distinction is important to a correct understanding of the Church's teaching. You cannot do something to thwart this goal of sex while still enjoying sex's other aims union and pleasure. Sixth, the usual approach to this question lacks any consideration of degrees of sin. They experience some sexual arousal and find it satisfying, though neither has an orgasm.
The intention or purpose can never justify an act with an evil moral object; such acts are intrinsically evil and always immoral. When an act is intrinsically evil, neither a good intention, nor dire circumstances, can cause the act to become moral. The Church says it is a sin to engage in sexual acts while trying to thwart the natural design of sex. Inside of marriage, sex is to end in the natural way, the husband ejaculates in his wife's vagina. This act is clearly an act of unnatural sex.