Most of the glans is covered with spines, except for an area near the tip. In comparison, the glans of felids is short and spiny, while that of viverrids is smooth and long. It is a reproductive , intromittent organ that additionally serves as the urinal duct. The human penis is made up of three columns of tissue: The baculum is clearly visible at the tip. In comparison, the human penis is larger than that of any other primate , both in proportion to body size and in absolute terms. June Learn how and when to remove this template message The penis of the bush hyrax is complex and distinct from that of the other hyrax genera. This enables them to reach the nearest female. The purpose of this is not fully understood. This has been most fully studied in bed bugs. The penis during this phase is not erect, but remains outside of its receptacle. Tapirs have exceptionally long penises relative to their body size.