I was around for the transition from zines to online posting, but my main fandoms then were Forever Knight and Buffy, which were pretty gender balanced and had plenty of het ships as well as slash -- and of course in Buffy, canon f/f.

After that I drifted in and out of fandoms, due to a change of where my energies were focused, and I stayed on LJ, then DW mostly to stay in touch with friends I'd made through fandom. I got back into writing fic through Yuletide maybe five years ago, and perhaps it's not surprising that in the smaller fandoms exchange, I've matched on requests for stories that were f/m or f/f oriented: The Hour, The Bletchley Circle, Halt & Catch Fire.

For whatever that's worth.