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and environmental factors (including fraternal birth order, where the number of older brothers a boy has increases the chances of homosexuality; specific prenatal hormone exposure, where hormones play a role in determining sexual orientation as they do with sex differentiation; The American Psychological Association has stated that "there are probably many reasons for a person's sexual orientation and the reasons may be different for different people".
It further stated that, for most people, sexual orientation is determined at an early age.
Bisexuality as a transitional identity has also been examined.
Bisexuality is romantic or sexual attraction to males and females.
The American Psychological Association states that "sexual orientation falls along a continuum.
In other words, someone does not have to be exclusively homosexual or heterosexual, but can feel varying degrees of both.
Sexual orientation develops across a person's lifetime–different people realize at different points in their lives that they are heterosexual, bisexual or homosexual." Sexual attraction, behavior and identity may also be incongruent, as sexual attraction or behavior may not necessarily be consistent with identity.Kinsey studied human sexuality and argued that people have the capability of being hetero- or homosexual even if this trait does not present itself in the current circumstances.