I write a lot of male slash and I will keep doing so, because I love the characters.
I do write some het and femmeslash pairings, too, because I love the characters.
I would write more females and het pairings, perhaps... if I enjoyed the sex...
Sadly, I do not enjoy getting penetrated (unless there are tentacles. O HAI WEIRD TENTACLE FETISH IA FHTAGN). And I prefer to be the one in control... Which makes it hard for me to identify with the woman in most het sex scenes. I can't be him and I don't want to be her. Hard to find a place to fit, yet again. If maybe there was more pegging and femdom out there I would participate more?
I know romance doesn't necessitate sex. I'm happy to both write and read fics without it. But I can't stop thinking deep down somewhere, who's gonna do whom???
Probably I am very fail for even thinking of this. But... yeah.
I don't want to erase anybody and I love a lot of characters regardless of gender. I have roleplayed characters of a variety of sexual expressions and genders...
So... yeah. It's all about the characters for me in the end. And I wish it wasn't about who fills whom, but it kind of is. Except when it isn't.
Sorry for the confusion.
ETA: And sorry for the incoherence. Just a few thoughts after the latest metafandom brouhaha!