- Certain kinds of acts are intrinsically evil and are therefore always immoral, regardless of circumstances, intention, or end.
- Unnatural sexual acts are intrinsically evil and are therefore always immoral.
- Each marital act must be open to life.
Show me references that establish how the acts referenced in points 1 and 2 *as foreplay * are immoral (since that is what the OP was asking about, not whether these acts were carried out until male orgasm, but acts done as foreply where the man attains orgasm in normal intercourse). Point #3 is a given.
Point 1 does not reference specific acts. It is a general principle to be applied in Catholic ethics. The Church teaches that there are certain acts that are always wrong because these acts are intrinsically disordered.
Since this is a general principle, I will cite a general example:
1753 A good intention (for example, that of helping one’s neighbor) does not make behavior that is intrinsically disordered, such as lying and calumny, good or just. the end does not justify the means. (CCC)
Notice that an intrinsically disordered act cannot be justified by intention or by its end.
Point 2 is a fairly general statement that unnatural sexual acts are intrinsically disordered.
An example here is found in homosexual acts, which are immoral because they are unnatural:
2357 Basing itself on Sacred Scripture, which presents homosexual acts as acts of grave depravity,[%between%](file:///C%7C/webplaces/CatholicPlanet2/catechism.htm#$2E4) tradition has always declared that “homosexual acts are intrinsically disordered.”[%between%](file:///C%7C/webplaces/CatholicPlanet2/catechism.htm#$2E5) They are contrary to the natural law. They close the sexual act to the gift of life. They do not proceed from a genuine affective and sexual complementarity. Under no circumstances can they be approved. (CCC)
Because unnatural sexual acts are intrinsically disordered, they cannot be justified under any circumstances, even in a marriage between a man and a woman. Nor can they be justified by including in a set of acts some acts that are intrinsically disordered and other acts which are moral.
On the question of using an unnatural sexual act as foreplay, we must apply the principle of moral theology that intrinsically disordered acts can never be justified under any circumstances.
lying is always wrong
lying in order to allow a greater truth to be known subsequently is still wrong
unnatural sexual acts are always wrong
performing such acts to facilitate or complete a subsequent or prior act of natural marital relations is still wrong.
Ron