Biphobia

Biphobia is the fear of or aversion to bisexuals. Biphobia is the portmanteau of bisexual and homophobia/heterophobia. A person suffering this phobia may only accept people who are attracted to one sex, but not the ones who are attracted to both sexes. It can be suffered by homosexuals, heterosexuals, and asexuals. Bisexual people may feel like their sexual orientation is less real than that of a monosexual (person who is attracted to one gender).