I came to this by following a series of links, and I'm glad I did. As a het member of fandom, I've found this the most enlightening of approaches to slash, particularly, as others here have commented, in regard to why m/m slash predominates. So, thank you for that.

I did wonder, though, why there was no mention of the work of Samuel R. Delany, who openly introduced gay (or queer) sexuality into his writing?