from working in the education field; this can include policies such as the American military's "Don't ask, don't tell" policy or Lech Kaczyński and other conservative Polish politicians' stance to exclude gay men and lesbians from entering the teaching profession. See also: LGBT rights in Poland Organized opposition to gay rights; labeling such rights and privileges as "special rights" or the "Gay Agenda"; Referring to a suspected criminal's homosexuality or bisexuality when in analogous situations there is no mention of a suspect's heterosexuality. Implicit or hidden This form of heterosexism operates through invisibility, under-representation, and erasure. It includes: Lack or under-representation of homosexual or bisexual people in advertising to the general public; Censorship of homosexual or bisexual characters, themes, and issues in works of art, literature, entertainment; see also "Sugar Time" episode of Postcards from Buster Exclusion of historical and political figures' and celebrities' homosexuality or bisexuality; their portrayal as heterosexuals; Complete avoidance of mentioning these people and their positive contributions particularly in news media; In the context of sex education or professional advice, referring only to female–male relationships when discussing female or male sexual attraction and activity; Silence on issues affecting homosexual and bisexual people at school or work or absence of their discussion in a positive light; Implementation and use of content-control software (censorware) to filter out information and websites that focus on homosexuality or bisexuality; Postal censorship and border control or customs seizure of publications deemed obscene solely on the basis of them containing material related to homosexuality even when they contain no erotic or pornographic material; see also Little Sister's Book and Art Emporium Work environments that tacitly require gay men, lesbians, and bisexuals not to reveal their sexual orientation via discussion of their relationship status while heterosexuals can discuss their relationships and marital status freely; At public libraries or bookstores: rejection, removal or destruction of books (e.g. Jenny lives with Eric and Martin), films, and posters with homosexual themes; Refusal to include families headed by same-sex parents at school events or to represent such family diversity in school curricula; see also anti-bias curriculum; Coercive or forced sex reassignment surgery on gay men, lesbian women, and bisexuals – an issue addressed in Tanaz Eshaghian's 2008 documentary, Be Like Others. See also: LGBT rights in Iran Forced disappearance, damnatio memoriae, ostracism, shunning, and other forms of social rejection geared towards making homosexual or bisexual people personae non