I have been writing a paper on biphobia today, and when this came up on my facebook newsfeed I was rather pleased.
As someone who might be called bisexual by others (not really a word I use myself for a variety of reasons that I have written about before and probably will do again), I have experienced a lot of these first hand.
Bisexual people can be promiscuous and they can be faithful or abstinent... just like anyone else. It just means that you are attracted to people of more than one gender. Not that you are attracted to everybody all the time.
It is also not a phase - sometimes people identify as bisexual for a while, and often it is a permanent state where people are attracted to more than one gender for their entire lives. One doesn't necessarily stop being bisexual when they are in a hetero-looking relationship - actually, that is sometimes when people are most in need of being part of the LGBTQ community, otherwise it can feel like one is denying a huge part of who they are.
I also really appreciate that the last row addresses some of the exclusion and biphobia that takes place from within the queer community.