Then, using a disposable tape measure, each participant had three parameters measured: circumference (girth) of the penile mid shaft; length from suprapubic skin to distal glans (skin-to-tip); and pubis to distal glans (bone-to-tip). The three measurements were recorded in the stretched flaccid state, grasping the glans and exerting a stretching force until the patient felt mild discomfort to obtain maximum stretch.
After the flaccid measurements were taken, each participant was offered the choice of watching pornography on a laptop provided. Watching pornography was either accepted and chosen privately and anonymously, or declined. At this point the urologist left the room. Participants pressed a digital bell to alert the urologist when they were erect and ready to repeat the measurements. Three men required an intracavernous injection of 10 μg of prostaglandin E1 in order to sustain an erection.