I agree with Dolixi, hedonism is about pleasure for pleasure sake whereas bisexuality is a pleasure that is attached to a gender appreciation that comes deeper within. And like any characteristic bisexuality has a scale with a broad range so it would difficult to bin everyone with a bisexual tendency into one bin. Whereas I think hedonism is easier to do that.
I also agree that altho loosely related there is a big difference for one, hedonism isnt just sexually related. As for the term bisexual or indeed str8 or gay, whilst ppl may have a preference or develop a preference after experimenting (which 99% do) if forced to use a notional label l prefer the term 'sexually fluid' than bisexual, one as it more accuratly reflects the truth and secondly it recognised that gender and sexuality is far more complex than just two or three narrow categories.
For me being Bisexual is being attracted to someone regardless of
their gender. Straight only fancy the opposite sex, Gay fancies
their own sex, Bi get the best of both. Bisexuals might be more
likely to be hedonistic or promiscuous as they all reflect the
removal of an inhibition. But it can also be expressed as a deeper
fondness, even love, of the partner regardless of whether they are
male or female. Having said that a Bisexual can't be faithful to
one partner. Ifyou become faithful to one partner the gender
of that partner automatically sets you bothas straight or gay.