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Measures of sexual orientation, which are free of the limitations of self-report, include genital arousal and pupil dilation while viewing sexual stimuli depicting men or women. Such measures include genital arousal to male and female sexual stimuli, assessed with penile gauges and vaginal plethysmographs. A pair of monozygotic twins discordant for homosexuality: Sex-dimorphic behavior and penile volume responses. Respondents included 6 male twin pairs and 9 female twin pairs reporting discordant sexual orientations, for a total of 30 individual twins. Given these prerequisites, it is noteworthy that we were able to collect data from 30 individual twins with discordant sexual orientations.

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Ryan. Age: 21.
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Because self-report is not always accurate, some research has focused on assessing sexual orientation with other measures.

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Lara. Age: 29.
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A set of regression analyses indicated that for male and female genital arousal, and male pupil dilation, twins and unrelated individuals did not significantly differ in the effect of sexual orientation on sexual response 0. We then computed z-scores of these averages within participants. However, this effect is especially common in heterosexual women, whereas homosexual women respond somewhat more to the same sex than other sex.

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