The problem is that (according to Catholic theology) the normal human sex drive is NOT functioning properly.
Its perfectly normal (and even healthy from a biological perspective) for a man to have sexual thoughts whenever he sees attractive women or to become aroused at displays of female sexuality (regardless of whether he knows or even likes the woman in question).
However, the Catholic Church (and most Christian churches) has a very different point of view. To them the normal human sex drive is abhorrent/corrupted.
In order to get healthy spiritually (according to the churches) the normal human sex drive must be suppressed and/or warped into something else.
So why not just have all scrupulous Catholics take drugs that suppress the human sex drive all the time. They would be happier, and we would be happier because their sex hating doctrines would largely die out with them.
Are you are professional caricature artist or something? Your description isn’t just distorted, it is all but unrecognizable. The idea that the flesh is evil and only the spirit can be good is a heresy that was formally condemned better than 1,500 years ago. (I’m terrible with heresy names). Catholicism absolutely affirms not only the goodness, but the sacredness of the gift of human sexuality. Our teaching, in fact, affirms that sexual relations are a basic part of marriage (so much so that the marriage doesn’t reach the status of indissoluble until it is consummated! Not that that’s often much of a problem, mind you…)
Perhaps you merely need a perspective. Nobody is crazy enough to claim that Catholicism is opposed to eating or forbids people from ENJOYING eating. But eating has similarities to sexuality: there is abusive and twisted forms of it that are inherently unhealthy. People who grossly overeat commit the sin of gluttony, for example. Anorexia and Bulemia are physical/psychological conditions that START by disordered outlooks on the purpose and meaning of eating. Everybody ‘gets’ this and nobody goes whacky and tries to equate these principles to calling food “abhorrent/corrupted.”
Yet when you get to sex, the spinmeisters show up to try to call bad good and good bad. Face it, sexuality misused has an enormous potential for harm. Surely we can agree that far. But instead of honestly debating where the healthy/unhealthy line occurs, you choose to use insults, distortion and mockery to make up for lack of a cogent argument.
Within the confines of its purpose and intent, human sexuality is a gift from God, in fact THE gift in which we most closely bear His image and likeness: the ability to create new life. Abhorrent, indeed.
But like food, the gift of sexuality can be misused and made destructive to our bodies and souls. I can relate. I have a hard time stopping a bag of Chips Ahoy once I get started. Same problem when a woman with a low cut top walks by. These are human frailties we’re called to learn to regulate and control. To be governed by our virtue, not just our appetites. Our passions are gifts given to help cement, nurture and sustain our lifelong marriages, but merely to gratify ourselves with.
Prudishness exists, but not as an actual tent of catholic teaching. Most often, it is an over- reaction people have against mistakes people have made themselves or consequences people have witnessed from mistakes others have made.
Jesus was speaking of influences in our lives, not literally our body parts. Example 56909 of why it’s good to belong to the Church empowered with authority to interpret Scripture! 
