The picture above shows the underside of the head of a fish. The body, the gills, and the mouth can all be seen in the picture.
The next picture is a drawing of bottom of a human penis. The drawing clearly shows the bottom of the shaft and the head of the penis.
The next picture compares the drawing of the underside of the penis to the picture of the underside of the fish.
Although the body of the fish is not visible, the body of the fish would compare to the shaft of the penis.
The mouth of the fish would match to the hole in the tip of the penis.
The intriguing part of the comparison is how the bottom of the head of the penis looks similar to the gills of the fish.
When taken together, all of those similarities make the bottom of a fish and the bottom of a penis look the same.
