"To press spots as euphoria" Why some people like to squeeze out spots at others

Why something like that rough, such eyforichesky? Even after ten years of marriage my wife cannot still tear off from me a hand. It not that you think. Sometimes at night, when children, at last, go to bed, and we remain one, it nestles closer and pushes a hand to me in back part of a shirt. It it is thin cut nails widely wander about my skin while it does not find IT: camber. Whether it be little eels or the big swelled-up spot, result same. It continues to squeeze it until it will not burst or my pathetic shouts about mercy somehow will not convince her to stop...