You conceded that frottage was the deliberate misuse of the sexual faculty. I think Persona Humana shows that the Church considers that the deliberate misuse of the sexual faculty is a sin, regardless of whether the act is masturbation, homosexual conduct, rape, fornication, frottage, or what have you.
Nodito it is not possible for me to continue discussing this with you because you appear to underestimate the importance of different words signalling very different concepts, definititions and underlying human realities.
This leads you to make generalizations and to conclude I am saying things that I clearly have not.
You appear to confuse physical events (“the acts of a human”) with “human acts.” One is in the Moral arena, the other is simply what is observed.
Hence taking a contraceptive and contracepting are not the same thing.
They may be on further enquiry, or they may not.
The killing of somebody may be homicide or even murder or neither. Aquinas himself observes that in some instances an observer may never know with certainty what Moral category of a human act the action of an observed man may fall into. For the ultimate deciding factor will be what that man purposed in his mind. His example is deciding if a killing is good or bad.
Now the physical act of killing is disordered in some way regardless of intent. Hence the command Though shall not kill.
So too is the physical act of manually ejaculating alone, not because it is the Moral act of masturbation (that is yet to be determined) but because reason sees it frustrates the natural teleological of the faculty.
However the point at issue, like killing, is this. Is the disorder so great it cannot be sought in such a way that love of God is directly confronted?
The Church teaches that killing, while disordered, is Not intending homicide if self defence is in fact one’s object. In other words, it is possible when killing not to intend killing… only in the case (call it circumstance if you wish but it is not the same as the circumstance of the 3rd font) of self defence.
Now I believe the same traditional analysis can be applied to the physical activity of frottage. Yes it is disordered like killing.
But if it is not done for pleasure then you are quite mistaken to introduce the word masturbation to describe the object in question.
That would be like saying our killer above was certainly homiciding , hang the bastard. You would be prematurely short circuiting the complete Moral analysis of the situation.
We do not know if frottage is so bad that it is like masturbation (no intention can engage in masturbation without directly challenging God) because the Church has never taught as far as I know, that frottage purposed for reasons other than pleasure is a mortal sin like masturbation.
The Church has clearly taught that purposed killing is not always mortal sin (in two cases only - cap punish and self defence).