If you’re a man, you may think you know your penis pretty well. But do you really? Take this health quiz and find out!

Something called post-micturition dribble is common, especially in men. Which of these is the telltale sign of this phenomenon?

Many men might forget to wash up after urinating, but post-micturition dribble actually happens when, after peeing, a bit of urine leaks out. It’s more common in men than women, especially those over age 50, because of a loss of tone in a specific muscle of the urinary tract. Fortunately, there’s a cure for it.

Which of these conditions increases the risk for erectile dysfunction (ED)?

While both a sore throat and arthritis pain might cause a man’s sex drive to take a temporary nosedive, diabetes is the only condition listed here that is a true possible cause of ED—the inability to get an erection and/or maintain it throughout intercourse. Diabetes damages nerves and small blood vessels, both of which need to be in good working order to achieve and keep an erection. So does heart disease.

One habit that may help prevent erectile dysfunction (ED) is to…

Phytochemicals called flavonoids that are especially abundant in blueberries have been found in studies to have a similar effect on sexual function as drugs such as sildenafil (Viagra). In one study, men who ate blueberries more than three times a week were 22% less likely to develop ED. Other good sources of flavonoids include apples, other berries, red grapes and red wine.

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Which of these are common early-warning signs of prostate cancer?

Prostate cancer, a malignancy of a small gland in the male urinary tract, rarely causes symptoms in the early stages. It can be screened for with a test that measures a substance in blood called prostate-specific antigen (PSA). There’s been debate over how effective PSA screening is and whether it can lead to overdiagnosis, though. Get the story here.

Urinary tract infections (UTIs) become more common in men after age…

These infections, common in women, are rare in younger men but become slightly more common in men after age 50. One age-related risk factor is having a benign enlarged prostate. But diabetes and obesity are risk factors for kidney stones, which also can lead to male UTIs.

If a man has clinically low levels of testosterone, he will feel fatigue and loss of libido.

Symptoms of low testosterone can include low libido, muscle weakness, fatigue and depression. But some men have clinically low blood levels of testosterone (below 300 ng/dL) yet have no symptoms. Other men have symptoms even with higher testosterone levels. Testosterone replacement therapy should be considered only after careful measurement and a symptom evaluation.

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If you have an erection that lasts longer than two hours and is painful, you should…

A prolonged and painful erection is called priapism and is considered a medical emergency. If it’s not treated within 24 hours, the penis could be permanently damaged. Some causes of priapism include not only drugs used to treat erectile dysfunction but also certain blood disorders, alcohol or drug abuse, injury, other prescription medications, an infection or a spider bite anywhere on the body (from a black widow spider).