This section is from the book "Human Sexuality", by J. Richardson Parke. Also available from Amazon: Human Sexuality.
It must always be remembered that attachments of this character between women are much more difficult of analysis than similar attachments between men, on account of the frequency of very close intimacies and friendships between the former, which are not founded on sexual motives; and yet, I am constrained to believe that very many of the close intimacies existing between highly bred, and entirely pure women have, it may be without the remotest suspicion on their part, a distinctly sexual basis. When a woman, therefore, feels herself so drawn to one of the same sex that she is willing to pass hours, and days, in her company; feels repugnance to the society of others; or begins to see in her friend qualities of mind, or body, not possessed by other women, she would better examine herself closely, with a view to determine the real character of her feelings.
 
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