Guys, when your scrotum gets squished between your thighs, which testicle moves forward?
Girls - you might not be aware that any anatomical diagrams of a man's testicles hanging symmetrically side by side are a simplification. This would actually be dangerous in reality. The gap between a man's thighs simply isn't wide enough for two testicles side by side, and the scrotum performs an important job keeping the testicles safe from being crushed by ensuring one testicle will always easily move forward and the other backward when getting squeezed between a man's thighs. If a man tries to force the wrong testicle to move forward and then close his thighs, he is likely to injure himself!
On a side note, the expression "how's it hanging?" and response "right down the middle" is running joke because it suggests symmetry is desirable, when in fact, it is undesirable because it would indicate the scrotum isn't doing it's job properly. In reality, since the scrotum positions one testicle more forwards, the penis always falls to the opposite side. It simply falls into the gap, the path of 'least resistance'. The horizontal cross section of penis and testicles would look a little like three circles tightly packed, nestled between two legs and clothing.
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