Old thread, but since someone spreading
erroneous teaching is linking to it, I will respond with what the Catechism actually says.
2362 "The acts in marriage by which the intimate and chaste union of the spouses takes place are noble and honorable; the truly human performance of these acts fosters the self-giving they signify and enriches the spouses in joy and gratitude."144 Sexuality is a source of joy and pleasure:
The Creator himself . . . established that in the [generative] function, spouses should experience pleasure and enjoyment of body and spirit. Therefore, the spouses do nothing evil in seeking this pleasure and enjoyment. They accept what the Creator has intended for them. At the same time, spouses should know how to keep themselves within the limits of just moderation.145 Catechism of the Catholic Church § 2362 quoting Pius XII’s address to midwives.
As for concerns about masturbation, that is stimulation
outside of “the sexual relationship which is demanded by the moral order and in which the total meaning of mutual self-giving and human procreation in the context of true love is achieved.” CCC 2352. So by the words of the Catechism, stimulation
inside the context of an encounter that leads to intercourse is NOT masturbation. In fact, sometimes such stimulation is necessary to prepare one partner or the other for intercourse.
So, enjoy yourselves by seeking the pleasure that God has provided, however you like, but keep it “within the limits of just moderation”.
Now, what are the “limits of just moderation?”
Anything that the truly human performance of activities that are noble, honorable, self-giving, enriching in joy and gratitude.
I would say that this is anything objectively harmful or subjectively degrading or demeaning to either partner would NOT be “within the limits of just moderation”.
The Church does not provide a “checklist” because “just moderation” varies from couple to couple. There are no body parts that are specifically off-limits, although some activities are so objectively harmful or unhealthy that they are never permissible, such as anal intercourse. But other than these, they are up to the couple. Some couples may find giving oral stimulation enjoyable, others may find it demeaning. This does not only refer to acts of foreplay, but intercourse itself: Different couples may be comfortable or uncomfortable with different sexual positions or sex during menstruation.
Additionally, remember that intercourse is God has designed as the proper expression of married sexuality. This is far more of an issue for men than for women. Male sexuality is limited in a way that female sexuality is not. Men are “one hit wonders”, while women have the capability to be the Energizer bunny (keep on going and going and going). (Nature shows this in anatomy. Male pleasure is
intrinsically linked to intercourse, female pleasure is merely
associated with it.)
To reduce sexual morality to finishing with tab A in slot B misses the point.
So, to determine whether this activity is OK or not, ask yourself the following questions:
Is this a loving activity or a lustful activity?
Is this intrinsically unhealthy?
Is this degrading, demeaning, or uncomfortable to either partner?
Does this enhance intercourse or is this a substitute for intercourse (especially for men)?
If you answer each question honestly, you will have the answer to your question.