To be honest, I joined so I could vote in a poll. I honestly forget the poll and why it was so important to vote in it that I went out of my way to sign up, but I did anyway.
I joined because, for the most part, people here talk in complete sentences, and are pretty inteligent.
I need my mind stimulated properly, and i enjoy watching people argue amongst one another here.
Every now and then I throw my input into everyone's faces, but I'm pretty much a nobody anyway.
I came here due to two reasons. First, there is (translated) H-manga here (and my former provide of these delicacies doesn't exist anymore). Second, there is an active general hentai community here. The latter is the reason I joined.