This document discusses heterosexual society's negative views of bisexuality. It identifies three primary reasons for discrimination against bisexuals: seeing them as promiscuous, feeling threatened by open sexuality, and assuming sexuality is dichotomous rather than a continuum. Negative attitudes were exacerbated by the AIDS epidemic in the 1980s and 90s. Men tend to be more biphobic than women as a way to affirm their masculinity by rejecting what is seen as unmanly. While some bisexual activity arises from desire, others engage in it due to comfort, necessity, or opportunity without intimacy. Overall, resentment toward bisexuals stems from cultural influences, beliefs, and ignorance of stereotypes.