Queer studies, sexual diversity studies, or LGBT studies is the study of issues relating to sexual orientation and gender identity usually focusing on lesbian, gay, bisexual, transgender, queer, questioning, and intersex people and cultures.Originally centered on LGBT history and literary theory, the field has expanded to include the academic study of issues raised in biology, sociology, anthropology, the history of science, philosophy, psychology, sexology, political science, ethics, and other fields by an examination of the identity, lives, history, and perception of queer people.