There is no simple definition of bisexuality
I agree with you, I know for myself this is true and from what I've seen and heard I suspect that it's also true for a great many people.Yes there is. Bisexuals experience some level of attraction to both sexes whether we act on it or not.
Some studies show that as much as 92% of the population is bi.
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Hedonistic bisexuals: Primarily straight or gay/lesbian but will sometimes have recreational sex with a different gender purely for sexual satisfaction.