Alan looked down at his penis. It seemed... smaller, somehow. He had always had a larger than average penis and wondered why it would be shrinking. He was not overly concerned, but in case it turned out to be something serious, he began to take measurements to have an objective record of what was happening.
The next morning confirmed Alan's suspicions. His penis was indeed getting smaller. And oddly, his hips seemed to be getting wider, as evidenced when his pants started to fit less than usual. Even his wife seemed to notice. He scheduled a doctor's appointment to determine what was going on.