The Dike Twins by D.W. Craig

Cover copy reads: 'They wore the name of the Forbidden Breed.

The tragedy of a girl doomed by her own unnatural desires.'

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From the back:

Monica And Margie Dike Were Identical Twins. Alike In Body But Very Different In Their Strange Tastes. “I Want To Be A Prostitute. I Know What I Am; What I Need.”
Monica Drew In A Deep Breath As She Studied The Beautiful Face Of The $100.00 Dollar Mulatto Call Girl. Margie’s Lovely Face Pleaded. ”I Want To Become Part Of Your World, Gina. I Know Society Says It’s Wrong–“