You raise an interesting point. The 'Q' can stand for either 'Queer' or 'Questioning.' Although I don't consider myself sexually queer, I'm definitely questioning traditional monogamy.
However, I wouldn't say that I'm LGBT-Q, as the moniker seems oriented towards people with non-traditional gender roles. I am (more or less) heterosexual, so I don't think I fit into that camp.
And, of course, I don't think it really matters what you call yourself as long as you're respectful of other people and having fun. So . . .