What determines sexual orientation (heterosexuality, bisexuality, and homosexuality)?

The factors that determine sexual orientation are complex. There is a growing understanding that human beings have a basic sexuality that can be expressed in a variety of relationships - homosexual, bisexual, and heterosexual - categories that are fluid and may overlap. Although the causes are not known, some researchers believe that one's basic sexual orientation is predisposed at birth. While one's orientation may not be recognized or acknowledged for many years, once established, it tends not to change.

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