Noretta Koertge 
Philosophy And Homosexuality [PDF ebook] 

For a balanced discussion of the main social, medical, and philosophical aspects of homosexuality, here is the ideal book. Written by philosophers of science, each comprehensive chapter takes a critical look at research on the etiology of homosexuality. Read Philosophy and Homosexuality and examine the evidence for both the sociobiological and hormonal explanations of homosexuality and study the definitions of sexual orientation and how they have affected research.