"Given that homophobia still exists, we need to challenge prejudice and defend our right to be gay. But in the long term, lesbian and gay identity is doomed. And a good thing, too. Like every other expression of human culture, homosexual and heterosexual identities are historically transient. They haven't always existed, and they won't last forever. Indeed, the weakening, blurring and eventual dissolution of the labels queer and straight will be final proof of the demise of homophobia."
He goes on to relate that,
"Some gay people find [this truth] disconcerting: while same-sex behaviour has existed since the beginning of human evolution, defining oneself as gay is a relatively modern invention and is unlikely to prevail in perpetuity. Homosexuality and homophobia exist in a cultural context, as do heterosexuality and heterophobia. Culture is man-made, not biologically given. It evolves and changes."
This view of gay identity chimes with one I believe Gore Vidal (currently on Radio 4) once expressed, to the effect that there is ultimately no such thing as "a homosexual" or "a heterosexual" only homosexual acts and heterosexual acts. In other words, in the end, a person's sexuality does not and should not define the whole person. It's a sentiment Michel Foucault would, I think, have shared.
Widen the frame of reference beyond sexuality and you'll find a similar approach to culture and identity in the New Generation Network manifesto for a new debate about race and faith. This is apparent not only in its specific condemnation of homophobia but also in its rejection of all forms of prejudice and for respecting multiple identities.
The argument, implicit throughout, is that identities evolve constantly, are never static, never fixed and never should be; and that the more it is insisted that freedom and equality for a particular group can only be won by forever maintaining and policing a rigid view of identity, be it ethnic, sexual, religious or whatever, the more the prospects for freedom and equality for most of that group's members are diminished.