Penis

Definition and stakes

L. Deslandes,  A Treatise on the Diseases Produced By Onanism…

“ When the young person is disturbed suddenly, his hands, if he has not had time to remove them, will be found on or near the genital organs. The penis, also, may be found in a state of erection; or you may even find marks of recent pollution, which might be known by the peculiar odor arising from the semen, and which comes from the soiled fingers. Have an eye to those young persons, whose hands, when in bed, or during sleep, are in the position described: they are onanists, or will become so. The same is true in those who frequently have erections of the penis. ”
Source: Gutenberg

Harland William Long,  Sane Sex Life and Sane Sex Living (1919)

“ The sex organs in a male human being consists, broadly speaking, of the penis and the testicles. All these are located at the base of the abdomen, between the thighs and on the forward part of the body. The penis is a fleshy, muscular organ, filled with most sensitive nerves, and blood vessels that are capable of extension to a much greater degree than any of their similars in other parts of the body. In a quiescent, or unexcited condition, in the average man, this organ is from three to four inches long and about an inch or more in diameter. ”
Source: Wikisource

Portrait of Robert James Culverwell Robert James Culverwell,  Porneiopathology

“ The penis is excited to erection by the influx or rush of blood into its cavernous or cellular structure; the scrotum becomes constricted, and compresses the testicles; the vesiculæ seminales, and the prostate gland, are also elevated by the muscles called levatores ani, as shown in the preliminary anatomical drawings, whence their use may now be better understood, as well as those of the perineal muscles, which all more or less assist in causing the prompt and forcible ejaculation of the spermatic fluid. ”
Source: Gutenberg

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