In order to determine whether or not a man has biological problems that result in erectile dysfunction, a therapist might

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Monitoring the man's erection during REM sleep can be a useful diagnostic tool to differentiate between physical and psychological causes of erectile dysfunction. During REM sleep, men typically experience multiple periods of penile tumescence (erections), regardless of sexual arousal or stimulation. If a man does not experience erections during REM sleep, this suggests a physical cause for his erectile dysfunction. Other options listed such as using a sexual surrogate or monitoring erections while looking at pornography may not accurately diagnose physical causes of erectile dysfunction. Checking for erections based on the need to urinate may not be a reliable indicator as it is a normal physiological response and does not necessarily indicate erectile function.

In Order to Determine Whether or Not a Man Has