Found the original published study. If you're curious, here's how they measured:
Quote:
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In the supine, frog-legged position with the legs abducted allowing the soles of the feet to meet, the distance from the posterior aspect of the scrotum to the anal verge was measured using a digital caliper (Neiko USA, Model No. 01407A) (Figure 1). The soles of the feet were between 12 to 18 inches from the buttocks for all measurements. The anal verge was marked as the anterior most point where the anus begins. The posterior aspect of the scrotum was the point where the rugated scrotal skin meets the perineum.
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I won't post Figure 1.