In the first, when mostly gay men were shown male-centered pornography, their penis became aroused and their pupils dilated, similar to gay men but to female-centered pornography, their penis and pupils were more aroused than was true for gay men when they viewed women masturbating. These findings were demonstrated among men with both physiological and self-report measures. For example, mostly lesbians and exclusive lesbians are similar in their attractions to women but differ in that mostly lesbians are more attracted to men than are lesbians. What is unique to mostly lesbians/gays also characterizes mostly straights: neither varies from their exclusive cousins in their attractions to their preferred sex but in their attractions to their “non-preferred” sex.
