I really have a large, very large penis

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• Penis | Complete Anatomy - Elsevier
  Explore the anatomy of the penis, its structure, function, arterial supply, innervation, and lymphatic drainage.
• Penis - Wikipedia
  Because of this a horse's penis can enlarge more than a bull's penis. The urethra is on the ventral side of the body of the penis. As a general rule, a mammal's penis is proportional to its body size, but this varies greatly between species – even between closely related ones.
• Penis - Structure, Function, Location, Anatomy, Diagram
  It consists of three main parts: the root, which anchors the penis to the pelvic region; the shaft, or body, which extends outward; and the glans, the rounded tip of the penis. The urethra runs through the penis, allowing for the passage of both urine and semen.
• Penis Anatomy: Gross Anatomy, Vasculature, Lymphatics and Nerve Supply
  The penile shaft is composed of three erectile columns, the two corpora cavernosa and the corpus spongiosum, as well as the columns' enveloping fascial layers, nerves, lymphatics, and blood...
• Penis: Location, Function, and Associated Diseases - Health
  The penis is a primary male reproductive organ. Its main functions are sexual intercourse and ejaculation of semen, as well as the release of urine from the body.
• 22.4: Penis - Medicine LibreTexts
  The penis is the male organ of copulation (sexual intercourse). It is flaccid for non-sexual actions, such as urination, and turgid and rod-like with sexual arousal. When erect, the stiffness of the organ allows it to penetrate into the vagina and deposit semen into the female reproductive tract.