There was an article on Xtra a while back on this veryt subject, titled You're Gay - Now Experiment:
Link.
When I first came out as a lesbian almost 10 years ago, the scene I just described would have been unthinkable. Lesbian women partnering with men? Straight men buying phallic sex toys? The queer world seemed very black and white to me at the time. If someone slept with a member of the opposite sex, I reasoned, they must be straight — or bisexual at least. But after a few years, I came to understand that sometimes what — and who — we do, doesn't always fully describe who we are. And in some cases, the gay and lesbian community might be guilty of enforcing the same kind of restrictive norms that make many heterosexual people unhappy.
Take my friend Adam, for example. He came out in high school, and has dated men ever since. But when we met in university, he was happily fucking queer women. He saw his occasional sexual encounters with women as an extension of his deep friendships with them.
Link.

