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Equally, otherwise heterosexual people who engage in occasional homosexual behavior could be considered bisexual, but may not identify as such.
For people who believe that sexuality is a distinctly defined aspect of the character, this ambiguity is problematic.
American Psychological Association states that sexual orientation "describes the pattern of sexual attraction, behavior and identity e.g.
homosexual (aka gay, lesbian), bisexual and heterosexual (aka straight)." "Sexual attraction, behavior and identity may be incongruent.
This was based on results of controversial penile plethysmograph testing when viewing pornographic material involving only men and pornography involving only women.
According to Kinsey's study, a substantial number of people fall within the range of 1 to 5 (between heterosexual and homosexual).
Although Kinsey's methodology has been criticized, the scale is still widely used in describing the continuum of human sexuality.
The same study found that 2.8 percent of women ages 18–44 considered themselves bisexual, 1.3 percent homosexual, and 3.8 percent as "something else". The Janus Report on Sexual Behavior, published in 1993, showed that 5 percent of men and 3 percent of women consider themselves bisexual and 4 percent of men and 2 percent of women considered themselves homosexual.
The 'Health' section of The New York Times has stated that "1.5 percent of American women identify themselves [as] bisexual. Alfred Kinsey's 1948 work Sexual Behavior in the Human Male found that "46% of the male population had engaged in both heterosexual and homosexual activities, or "reacted to" persons of both sexes, in the course of their adult lives".
Individuals who do not experience sexual attraction to either sex are known as asexual.