Question in title. Also, what would happen if you forced it down much further than comfortable? Could you cause damage?
In: Biology
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Essentially, an erection upon arousal is simply the penis filling with blood due to artery dilation, resulting in expansion of spongy penile tissue. At the end of arousal, the arteries constrict, and blood is drained away by a large vein, returning the penis to a flaccid state.
However, whilst aroused, the arteries are still dilated and engorged with blood, thus, the penile tissue is constricting the vein that would normally drain the blood.
Thus, the high volume contained within the limited space of your spongy tissue results in a large pressure within the penis, whereby trying to oppose this rigid force by forcing it to move is quite difficult.
If we apply this thinking to your scenario, with enough force applied in little time, you could very possibly cause damage; cases of penile fracture are reported relatively uncommonly. Think of it similarly to completely filling a balloon with water, and tieing off the end. If you were to mangle and reshape the balloon whilst filled with water, you would likely pop it.
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