Some bisexual people may have concurrent lovers, but bisexuals do not need to be with both sexes in order to feel fulfilled. Bisexuals are promiscuous hypersexual swingers who are attracted to every woman and man they meet. Bisexuals cannot be monogamous, nor can they or live in traditional committed relationships. They could never be celibate. Like lesbians, gays or heterosexuals, some have multiple partners, some have one partner, some go through periods without any partners.
Promiscuity is no more prevalent in the bisexual population than in other groups of people.
Combine our society's extreme heterosexism and homophobia with lesbian and gay hesitance to accept bisexuals into their community, and it might be more accurate to say that bisexuals get the worst of both worlds. Bisexuals don't radiate raw sex any more than lesbians, gays, or heterosexuals. If a bisexual woman has a hard time meeting people, her bisexuality won't help much. Bisexuals are desperately unhappy, endlessly seeking some kind of peace which they cannot ever find.