Research shows genetic influence on sexual orientation in twins but also suggests other factors are at play.
Research points to certain genetic and other biological roots of sexual orientation but is by no means conclusive. One line of research concerns genetics. Although no 'gay gene' has been discovered, studies of identical twins find they are more likely to have the same sexual orientation (gay or straight) than would be expected from chance alone. Because identical twins have the same DNA, this similarity suggests, but does not prove, a genetic basis for sexual orientation.
Keep in mind, however, that any physical or behavioral trait that is totally due to genetics should show up in both twins or in neither twin. Because many identical twins do not have the same sexual orientation, this dissimilarity suggests that genetics are far from the only cause of sexual orientation, to the extent they cause it at all.
Several methodological problems also cast doubt on findings from many of these twin studies. A recent review concluded that the case for a genetic cause of sexual orientation is far from proven.
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