http://men.webmd.com/features/life-cycle-of-a-penis
There are two major changes. The head of the penis (glans) gradually loses its purplish color, the result of reduced blood flow. And there is a slow loss of pubic hair. "As testosterone wanes, the penis gradually reverts to its prepubertal, mostly hairless, state," says Irwin Goldstein, MD, director of sexual medicine at Alvarado Hospital in San Diego and editor-in-chief of The Journal of Sexual Medicine.
"In some cases, abdominal fat all but buries the penis," says Ronald Tamler, MD, PhD, co-director of the Men's Health Program at Mount Sinai Hospital in New York City. "One way I motivate my overweight patients is by telling them that they can appear to gain up to an inch in size simply by losing weight."
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There are two major changes. The head of the penis (glans) gradually loses its purplish color, the result of reduced blood flow. And there is a slow loss of pubic hair. "As testosterone wanes, the penis gradually reverts to its prepubertal, mostly hairless, state," says Irwin Goldstein, MD, director of sexual medicine at Alvarado Hospital in San Diego and editor-in-chief of The Journal of Sexual Medicine.
"In some cases, abdominal fat all but buries the penis," says Ronald Tamler, MD, PhD, co-director of the Men's Health Program at Mount Sinai Hospital in New York City. "One way I motivate my overweight patients is by telling them that they can appear to gain up to an inch in size simply by losing weight."
See link for full article