If a male is using the nocturnal penile tumescence test, one could suspect he is being assessed for:

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The nocturnal penile tumescence test is used to assess for erectile disorder, also known as erectile dysfunction. During the test, the male wears a device that measures the frequency and strength of his nocturnal (nighttime) erections. This information can help diagnose the cause of erectile dysfunction, such as physical, psychological, or neurological factors. Premature ejaculation disorder, hypoactive desire disorder, and sexual aversion disorder are all different conditions that would not be diagnosed through the use of the nocturnal penile tumescence test.

If a Male Is Using the Nocturnal Penile Tumescence Test