Hmm, answering the first question last. Well it certainly doesn't apply to me as I don't want to turn anything into het sex, just because I don't find it appealing to me. I agree with callumjames comments in that the majority of slash - m/m or f/f - has nothing at all to do with gay reality. I read and enjoy it anyway. One could, I think, equally argue that most het romance doesn't have much to do with heterosexual reality. And due to my own sexuality (perhaps having a more male brain?) I enjoy good gay and lesbian written films/porn/fiction just as much but in a different way. A bit like sweet and savoury.

And from the reverse perspective would this mean that to the writer of the mentioned book if I wrote het it would be me putting lesbians into heterosexual couplings? My first reaction to that is why would I bother? I think there are plenty of reasons why people read and write anything, there aren't any single one size fits all answers.