Bisexuality ≠ promiscuity
Bisexual people (the B in LGBT) are often stigmatized in both straight and queer communities. Defined as those who like people of more than one gender, they’re regularly seen as indecisive, impossible-to-satisfy cheaters.
That’s not the case.
Imagine a woman considering a relationship with a bisexual man. She might think “since he also likes men, he’ll never be fully satisfied with a woman and will eventually cheat with a man.” (This is sadly a very common, and very misguided, thought process.)
First off, straight and gay people cheat too, so bisexuality is not the culprit. Secondly, that’s like saying “if a man likes both blondes and brunettes, then he’ll never be truly satisfied with a blond woman and will cheat with a brunette.”
It sounds absurd because it is.