this post was submitted on 30 Jan 2024
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The corpos cavernosum does indeed fill with blood to cause an erection. There are however several muscles in and attached to the penis.
You have to remember the penis actually extends into the body of the person slightly, and is held by two main muscle groups. The bulbospongious muscle (ever squeeze a water balloon so it stretches tighter? It's like that for penis blood), and the ischiocavernosus (a check valve for blood basically).
There is also the suspensory ligament, which is how you can make it nod hello.