About 1.7 percent of men and 1.1 percent of women in the united states define themselves as partly or entirely homosexual.
Homosexuality is one of the three main categories of sexual orientation on the heterosexual and homosexual continuum, in addition to bisexuality and heterosexuality. Scientists still don't know the exact cause of sexual orientation, but they believe it is caused by a complex interplay of genetic, hormonal, and environmental influences, and don't view it as a choice.
Although no single theory of the causes of sexual orientation is yet widely supported, scientists prefer biologically based theories. There is much more evidence for nonsocial, biological causes of sexual orientation than for social causes, especially for men. There is strong evidence that parenting and childhood experiences are related to sexual orientation. No proof. Some people think homosexual behavior is unnatural, but scientific research shows that homosexuality is a normal and natural variant of human sexuality, and is not in itself the cause of adverse psychological effects.
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