Each title in the highly acclaimed Opposing Viewpoints series explores a specific issue by placing expert opinions in a unique pro/con format; the viewpoints are selected from a wide range of highly respected and often hard-to-find publications.; This title explores whether sexual orientation is biological or environmental or neither; whether same-sex marriage and adoption should be legal; and whether it is appropriate to exclude homosexuals from such institutions as the military, the boy scouts; "Each volume in the Opposing Viewpoints Series could serve as a model not only providing access to a wide diversity of opinions, but also stimulating readers to do further research for group discussion and individual interest. Both shrill and moderate, th"