Judith Butler is a renowned philosopher known for her theories on gender and sexuality. In her influential book "Gender Trouble", she argued that feminism reinforced a binary view of gender that limited human possibilities for identity. Rather than opening up identity, feminism had closed options down. Queer theory emerged in the 1990s from LGBT and feminist studies to provide queer readings of texts. It examines how social constructs shape understandings of sex acts and identities. Queer theory looks beyond natural/unnatural divides to encompass diverse sexualities and identities.