I'm very fond of queer meaning not-straight, and also meaning not-bi-because-gender-isn't-binary. Most people I know who identify as queer are bi- or pansexual, but some are gay people who've read a lot of queer theory and some are not even particularly sexual. Also, sexual practices done by mixed-sex couples can be queer, like pegging. And there's queer theory which can extend even beyond sexuality...