If you were to put “sexual orientation definition” into an Internet search engine, you’d discover a variety of definitions. My definition is a modification of one offered by Dr. Ritch Savin-Williams in his book, The New Gay Teenager.
Sexual orientation is the preponderance of one’s emotional and physical attractions — whether stable or fluid — to males, females, both, or neither.“Preponderance” means “the weight of the evidence.” The evidence that points to the truth about your sexual orientation is rooted in your attractions — both emotional and physical — to other people. Dr. Savin-Williams and I do not include sexual behavior in the definition because even a celibate person has a sexual orientation.
My definition acknowledges that some people do not experience sexual attraction for others. The term for this sexual orientation is "asexual" (the prefix a- means "not"). Many asexuals do experience emotional attractions for others. Some asexuals will define their "romantic orientation" using a term such as "hetero-romantic," "homo-romantic," or "bi-romantic." To learn more, check out the book Understanding Asexuality and visit the Asexual Visibility and Education Network website.