http://crx.sagepub.com/content/41/5/665
>"Our study suggests that the more heterosexual men, especially less educated heterosexual men, watch pornography, the more supportive they become of same-sex marriage," …
>"Pornography adopts an individualistic, nonjudgmental stance on all kinds of nontraditional sexual behaviors and same-sex marriage attitudes are strongly linked to attitudes about same-sex sex. If people think individuals should be able to decide for themselves whether to have same-sex sex, they will also think that individuals should be able to decide for themselves whether to get married to a partner of the same-sex."