I guess what I don't understand is why would MB for the sake of better understanding your body so that when IC occurs it will be a better experience, be bad (taking a breath). And I also don't see why IC must be a part of the sexual experience. It seems like any form of sex can be an act of love, and any form of sex can be just for personal gratification depending on the intentions of the people involved.
Anyway, I could go on and on, but it seems like the church (not just catholics but many forms of organized religion) is just painting too broad a brush-stroke, like it tends to do with many different matters. JMHO.
"Recollect me darlin, raise me to your lips, two undernourished egos, four rotating hips"
