legitimate orientations, dismissing bisexuality as "secondary homosexuality". In that model, bisexuals are presumed to be either closeted lesbian/gay people wishing to appear heterosexual, or individuals (of "either" orientation) experimenting with sexuality outside of their "normal" interest. Maxims such as "people are either gay, straight, or lying" embody this dichotomous view of sexual orientation. Some people accept the theoretical existence of bisexuality but define it narrowly, as being only the equal sexual attraction towards both men and women. Thus the many bisexual individuals with unequal attractions are instead categorized as either homosexual or heterosexual. Others acknowledge the existence of bisexuality in women, but deny that men can be bisexual. Some denial asserts that bisexual behavior or identity is merely a social trend – as exemplified by "bisexual chic" or gender bending – and not an intrinsic personality trait. Same-gender sexual activity is dismissed as merely a substitute for sex with members of the opposite sex, or as a more accessible source of sexual gratification. Situational homosexuality in sex-segregated environments is presented as an example of this behavior. Biphobia is common from the heterosexual community, but is frequently exhibited by gay and lesbian people as well, usually with the notion that bisexuals are able to escape oppression from heterosexuals by conforming to social expectations of opposite-gender sex and romance. This leaves some that identify as bisexual to be perceived as "not enough of either" or "not real." An Australian study conducted by Roffee and Waling in 2016 established that bisexual people faced microaggressions, bullying, and other anti-social behaviors from people within the lesbian and gay community. Bisexual erasure (also referred to as bisexual invisibility) is a phenomenon that tends to omit, falsify, or re-explain evidence of bisexuality in history, academia, the news media, and other primary sources, sometimes to the point of denying that bisexuality exists. Kenji Yoshino (2000) writes that there are three concepts that cause invisibility within bisexuality: "The three invisibilities can be seen as nested within each other; the first affects straights, gays, and bisexuals; the second affects only gays and bisexuals; and the third affects only bisexuals." Forms of social standards and expectations, religion, and integrating the same-sex attraction aspect of bisexuality with homosexuality contribute to invisibility. Allegations that bisexual men are homophobic One cause of biphobia in the gay male community is that there is an identity political tradition to assume that acceptance of male homosexuality is