This section is from the book "Human Sexuality", by J. Richardson Parke. Also available from Amazon: Human Sexuality.
And the same may be remarked of the proposition of another author, Mantegazza,' who endeavored to account for contrary sexuality by an error of nature, in distributing to the rectum certain sexually sensitive nerves originally intended for the genitals; thus reversing the seat of lustful Bensation, and accounting, or endeavoring to account, for sexual abnormality on a purely, physiological ground.
Not to mention the well-known fact that many men are inverted to whom intercourse by the rectum is avowedly abhorrent, this ridiculous theory of a usually acute reasoner makes no provision whatever for the psychical side of the subject; nor any effort to explain those numerous phases of inversion where men are passionately attached to men, and women to women, without, as I have heretofore shown, the slightest desire for sexual intercourse.
 
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sexuality, reporduction, genitals, love, female, humans, passion