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Bisexuality refers to sexual behavior with  or attraction to people of multiple genders, or to a bisexual orientation.
People who have a bisexual orientation "can experience sexual, emotional, and affectional attraction to same and opposite genders"; "it also refers to an individual’s sense of personal and social identity based on those attractions, behaviors expressing them, and membership in a community of others who share them." It is one of the three main classifications of sexual orientation, along with a heterosexual and a homosexual orientation.
Critics state that this study works from the assumption that a person is only truly bisexual if he or she exhibits virtually equal arousal responses to both opposite-sex and same-sex stimuli, and have consequently dismissed the self-identification of people whose arousal patterns showed even a mild preference for one sex.
Some researchers say that the technique used in the study to measure genital arousal is too crude to capture the richness (erotic sensations, affection, admiration) that constitutes sexual attraction. The study, and The New York Times article which reported it, were subsequently criticized as flawed and biphobic.
A recent study by researchers Gerulf Rieger, Meredith L. Michael Bailey, which attracted media attention in 2005, purported to find that bisexuality is extremely rare, and perhaps nonexistent, in men.
Although Kinsey's methodology has been criticized, the scale is still widely used in describing the continuum of human sexuality.
These include lifelong monogamy, serial monogamy, polyamory, polyfidelity, promiscuity, group sex, and celibacy.
For those with more than one sexual partner, these may, or may not, all be of the same gender.
On the other hand, some believe that the majority of people contain aspects of homosexuality and heterosexuality, but that the intensities of these can vary from person to person.
Some people who engage in bisexual behavior may be supportive of homosexual people, but still self-identify as heterosexual; others may consider any labels irrelevant to their positions and situations.
Equally, otherwise heterosexual people who engage in occasional homosexual behavior could be considered bisexual, but may not identify as such.