Every penis head is unique, but there are some common shapes.
The "Standard" penis head is both curved and a bit pointed. This is the shape that most people think of when they imagine the head of a penis. The head is larger at the base than at the tip, and the underside of the head is curved smoothly.
The "Triangle" head is much more pointed than the standard one. Instead of a smooth curve from the base to the tip, it has more of a straight line edge. The underside is very much like the standard head shape.
The "Knob" head is very different from the standard and the triangle. It is like one big curve from the base all the way to the tip. The tip is not pointed at all, and is more like a doorknob. The underside of the knob head is round just like the top.
The "Helmet" head is like the standard, just with more extreme curves. The base curves more sharply on the way to the tip, almost going a bit inward before bending up to the tip. The tip is more rounded than the standard, and the underside of the head is more extremely curved.
The "Bullet" head is like a knob head that has been stretched. The tip is more pointed than a knob head, but it is still more round than the standard. The underside is often very smoothly round, as well, making the whole head look like a bullet.
Many penises fit very well into a particular shape category, and others seem to be a mix of two of them. This guy's head is a special kind of helmet. I guess I'll call his beauty "Beetle" as it's shape makes me think of the exoskeleton of such species.
