clipped from: www.cbsnews.com   
No. 1: Your Penis Does Have a Mind of Its Own

the penis answers to a part of the nervous system that's not always under your conscious control

Sexual arousal usually isn't voluntary

impulses from the brain during the REM phase of sleep cause erections, whether you're dreaming about sex or about a test you forgot to study for

When you're relaxed and feeling well, your flaccid penis looks bigger than when you're stressed out.

"How's it hanging?" is more apt than you might have realized.

no consistent relationship between the size of the flaccid penis and its full erect length

shorter flaccid penises tend to gain about twice as much length as longer flaccid penises

In an MRI picture, the penis looks distinctly boomerang-like, as noted by a French researcher who studied men and women having sex inside an MRI scanner.

No. 4: You Can Break Your Penis

there's "an audible pop or snap," Montague says. Then the penis turns black and blue. And there's terrible pain

No. 5: Most Penises in the World Are Uncut