Not only do bi-sexuals exist, they also come in many different flavors according to health24.com.

Alternating bisexuals: may have a relationship with a man, and then after that relationship ends, may choose a female partner for a subsequent relationship and many go back to a male partner next.

Circumstantial bisexuals: primarily heterosexual, but will choose same sex partners only in situations where they have no access to other sex partners, such as when in jail, in the military, or in a gender-segregated school.

Concurrent relationship bisexuals: have primary relationship with one gender only but have other casual or secondary relationships with people of another gender at the same time.

Conditional bisexuals: either straight or gay/lesbian, but will switch to a relationship with another gender for financial or career gain or for a specific purpose, such as young straight males who become gay prostitutes or lesbians who get married to men in order to gain acceptance from family members or to have children.

Emotional bisexuals: have intimate emotional relationships with both men and women, but only have sexual relationships with one gender.

Integrated bisexuals: have more than one primary relationship at the same time, one with a man and one with a woman.

Exploratory bisexuals: either straight or gay/lesbian, but have sex with another gender just to satisfy curiosity or “see what it’s like”.

Hedonistic bisexuals: primarily heterosexual but engage in gay or lesbian sex only when under the influence of drugs and / or alcohol.

Isolated bisexuals: 100% straight or gay / lesbian now but has previously had sexual experiences with another gender in the past.

Latent bisexuals: completely straight or gay lesbian in behaviour, but have strong desire for sex with another gender, but have never acted on it.

Motivational bisexuals:straight women who have sex with other women only because a male partner insists on it to titillate him.

Transitional bisexuals: temporarily identify as bisexual while in the process of mowing from being straight to being gay or lesbian, or going from being gay or lesbian to being heterosexual.