While a majority of people identify as "heterosexual" if asked about their sexual identity, what does that really mean? How did identifying as "straight" arise, particularly in relation to identifying as "queer," "lesbian," and "gay"? How are individuals socialized to view themselves and others as straight, even when many people are sexually fluid? How do institutions like government bodies, the educational system, and the family reinforce heterosexuality? This collection introduces the field of Critical Heterosexualities Studies and key lines of inquiry within the field.