Heterosexism: the belief, stated or implied, that heterosexuality is superior (religiously, morally, socially, emotionally, behaviourally, and/or in some other way) to other sexualities; the presumption that all people are heterosexual (may be conscious or unconscious); the belief that all people should be heterosexual. As an institutionalized system of oppression, heterosexism negatively affects LGBTI people as well as some heterosexual individuals who do not subscribe to traditional standards of masculinity and femininity.
Source: ILGA Europe
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