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    8 Things You Didn't Know About Your Penis

    Sensitivity, pleasure, size, and other surprising facts.
    (continued)

    5. Vibrators Work on the Penis Too

    Vibrators aren't only for women. They work on the penis, too. In fact, vibration is so effective on the penis that often men with spinal cord injuries can ejaculate with the aid of a special medical vibrator. For this kind of treatment, the vibrator is usually held against the underside of the head of the penis.

    "Medical-grade vibrators aren't necessarily more powerful," Kohler says. The vibrators are tuned to stimulate parts of the nervous system involved in ejaculation. "They work at frequencies or amplitudes that are more specific to the [nerve] pathways."

    Most men don't need a medical vibrator to trigger an orgasm. Kohler says when patients see him about delayed ejaculation -- difficulty reaching orgasm -- he suggests they try a store-bought vibrating personal massager.

    Although vibrators often help men with ejaculation problems, you don't have to have any kind of medical condition to use one. You could do it just for fun.

    6. There's More to the Penis Than Meets the Eye

    "Most guys would be proud to know that their penis is twice as long as they think it is," Kohler says.

    That's because half the length of the penis is inside your body. Just like you don't see all of a big oak tree above ground, you don't see the root of your penis tucked up inside your pelvis and attached to your pubic bone.

    As seen in an MRI picture, an erect penis is shaped like a boomerang.

    7. Your Penis Is a Habitat

    The skin of your penis is home to a diverse community of bacteria.

    Lance Price, PhD, and Cindy Liu, PhD, researchers at the Translational Genomics Research Institute, in Flagstaff, Ariz., used genetic tests to identify the bacteria found on men's penises. Their study showed there were a total of 42 unique kinds of bacteria inhabiting the skin of the penis.

    "We see that the human body is essentially an ecosystem," Price says.

    But uncircumcised and circumcised penises don't have the same variety and abundance of bacteria, the study showed. The researchers first analyzed samples from the penises of 12 men who were planning to get circumcised. Samples were taken and analyzed again after the men were circumcised.

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