When you ask a psychologist or any person for that matter a question regarding bisexuality, then part of their answer will reflect their culture, religion, morals or beliefs.

I do believe that bisexuality exists and if you wish for some psychological evidence of this, then check out the Kinsey Scale. It's a psychological self-test invented years ago and is very well-accepted. Essentially it views sexual orientation on a continuum rather than being only heterosexual or only homosexual. It defines bisexuality is equal attraction to both genders, however, there still are rankings between heterosexuality and bisexuality, and homosexuality and bisexuality.

Here is a link to the Kinsey Institute with the Kinsey Scale: http://www.kinseyinstitute.org/resou...k-hhscale.html

Personally I see no reason why bisexuality wouldn't exist. It is a somewhat ambiguous term as some people define it as attraction to both genders (unequal attraction) whereas others, such as the Kinsey Scale, define it as equal attraction to both genders.