“Perhaps if more people realized that coupling in higher organisms is fundamentally about bonding, not only about the drive to reproduce, there would be less prejudice against homosexuality. In fact, homosexuality is natural and common in the animal kingdom. In a 2009 review of the scientific literature, University of California at Riverside biologists Nathan W. Bailey and Marlene Zuk, who advocate more study about the evolutionary impetus for homosexual behavior, state, “The variety and ubiquity of same-sex sexual behavior in animals is impressive; many thousands of instances of same-sex courtship, pair bonding and copulation have been observed in a wide range of species, including mammals, birds, reptiles, amphibians, insects, mollusks, and nematodes.”