A) bisexuality is a myth. So-called bisexuals are homosexuals who are not able to come fully out of the closet, http://lesbianlife.about.com/b/2005/07/06/is-bisexuality-a-myth.htm and heterosexual women pretending to be bi so as to turn heterosexual men on. Girls will tease guys by pretending to be bi - thus creating the impression that they are some kind of exciting action and sparking the interest of the boys, just to get attention. B) everyone realizes what gender they are sexually aroused by in their teen years when they're experiencing sexual arousal for the first time.