P.S my first post here in a long time, just recently returned after a looking absence, nice to be back
Great post, too.
There's also a little bit of the Bechdel Test, specifically when it comes to gay women's distrust of bisexual women. (Not to mention straight men's distrust of gay, and bisexual men.)
Like a conversation, they're worried about a dick being inserted into their relationship, but it's not usually a problem. It's an insecurity, and another form of Biphobia.
Bisexual people are just like Hetero, and Homosexual people. We can be monogamous, celibate, or cheat on our partners. We're just theoretically more likely to cheat with Either of the (Most common) genders, but it's still cheating. If you have a monogamous partner, the gender of the person you're cheating with doesn't make it any more, or less cheating.
We are no more likely to cheat, nor remain faithful than hetero, or homosexual partners.