From Robert Chalmer's interview in The Independent:
"But you're convinced that, to put it crudely, when you die, that's it." "No," Vidal replies. "I wouldn't say: 'When you die, that's it.' I'd say: 'When you're born, that's it.'"
UPDATE: From the 06/15 NYT Magazine:
Are you a supporter of gay marriage? I know nothing about it. I don’t follow that.
Why doesn’t it interest you? The same reason heterosexual marriage doesn’t seem to interest me.
If we look at the situation apart from you — It’s my interview, so we’ve got to stay with me.