I am bisexual and polyamorous. I currently have a wife and two girlfriends. No boyfriends at the moment, but I am not averse to the idea.
I met my wife at a bar while we were both stationed in Italy.
I met my first girlfriend through a dating website. I met my second girlfriend at a kinky Camp when she was in desperate need of a good hug. Somewhat ironically, I did meet her before I met my first girlfriend.
As you might see, LGBTQ folks meet people in the same ways that straight people meet each other.
This might be something of a revelation, but LGBTQ people are pretty much just like everybody else. Most of us are good people, some are assholes. Some of us are comfortable with who we are, some are not. Some of us are religious, some are not. If you saw me walking down the street on an average day, you would have no idea that I am queer.