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Up until the last decade, rates of ED were low in sexually active men under 40, and did not begin to rise steeply until thereafter [1,2].
A 2014 cross-sectional study of active duty, relatively healthy, male military personnel aged 21–40 employing the five-item IIEF-5 found an overall ED rate of 33.2% , with rates as high as 15.7% in individuals without posttraumatic stress disorder .
The researchers also noted that sexual dysfunctions are subject to underreporting biases related to stigmatization , and that only 1.64% of those with ED had sought prescriptions for phosphodiesterase-5 inhibitors through the military .
ED is usually classified as either psychogenic or organic.
Psychogenic ED has been related to psychological factors (e.g., depression, stress, generalized anxiety, or performance anxiety) while organic ED has been attributed to physical conditions (e.g., neurological, hormonal, anatomical, or pharmacologic side effects) .