They possess a baculum that, together with a cavernous body, helps to create a copulatory tie during mating, locking the animals together for up to an hour.

The image was repeated not only on the command console but in the cavernous body of the approaching Hercules so that the men who would be called to occupy those positions could study them now and prepare themselves thoroughly for the moment.

The root consists of the expanded ends of the cavernous bodies, which fan out to form the crura, and attach to the pubic bone and the expanded end of the spongy body also known as the bulb.