The penis advice columnDear Marilyn:

I have hair going up the shaft of my penis. Is this normal?

—Daniel F., Tulsa, OK

Dear Daniel:

Hair on human bodies varies by individual. Penile shaft hair is rare but most frequently it is the result of circumcision, which pulls scrotal skin onto the shaft. Men with this problem sometimes manually remove the hairs one-by-one with a tweezer, or resort to electrolysis to eradicate unwanted hair growth on the shaft. If we stop doing circumcisions, this problem will end.