Random masturbation dating
In a 1996 study, researchers looked at the penises of normal men (that is to say - a random sample from the general population) to establish what exactly constitutes "normal" penis size.
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Of course, how much penile length you have available to engage in lovemaking depends on how much fat you have over your pubic bone.
The shaft of the penis hidden within this fat is effectively not available for intercourse!
The penile circumference was measured midway along the shaft; the fat pad depth by pushing the tape into the pubic bone.
All the men in this investigation had an intracavernous injection of Prostaglandin designed for evaluation of their erectile dysfunction; the measurement of their penises was taken during these investigations.