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The body is full of sensory nerves, communicating through both the peripheral and central nervous systems. For instance, the densest nerve center in your body besides the brain is the stomach, with an incredibly rich network of cells all working to ensure that food can be digested and that it's function can be maintained.
I contend that the purpose of the nerve centers throughout the reproductive systems of both men and women are to communicate with the parts of the nervous system responsible for sexual arousal and facilitating their function as a means of continuing the species and participating in the miracle of creation. It is known that exciting these areas with electricity can bring on orgasm involuntarily, and that the factors that go into attraction, orgasm response, and automatic nervous processes are not fully understood.
It's important to keep in mind that pleasure is not the end goal, as it has been clearly established in Scripture and in the teachings of the Church that we are here to glorify God and participate in creation through His will.