page_title: List of gay, lesbian or bisexual people: Sd–Si
section_title: Sd–Si
hierarchical_section_title: List of gay, lesbian or bisexual people: Sd–Si / Sd–Si
caption_attribution_description: English: Ellen Kushner and Delia Sherman. Photograph by Keyan Bowes
context_page_description: Parent article: List of gay, lesbian or bisexual people;
  Siblings:
  The historical concept and definition of sexual orientation varies and has changed greatly over time; for example the word "gay" was not used to describe sexual orientation until the mid 20th century. A number of different classification schemes have been used to describe sexual orientation since the mid-19th century, and scholars have often defined the term "sexual orientation" in divergent ways. Indeed, several studies have found that much of the research about sexual orientation has failed to define the term at all, making it difficult to reconcile the results of different studies. However, most definitions include a psychological component and/or a behavioural component. Some prefer to simply follow an individual's self-definition or identity.
  The high prevalence of people from the West on this list may be due to societal attitudes towards homosexuality.
caption: Writer Delia Sherman
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