As a statement about myself, I would say that I'm bi with a preference toward men.
So, out of habit (from not usually having male options available to my male characters), many of my first characters are female. I've typically played heterosexual females, in order to romance the male options I'm interested in (Alistair and Sebastian, for example). However, I've also made and planned lesbian relationships before (such as with Leliana and Isabela). And I've romanced women with my male characters (Morrigan).
I don't really care about sexuality (with the small exception of when they're gender-locked). I planned on romancing Sebastian with my very first Hawke. Instead, I was fascinated with Isabela, slept with her, and my first Hawke was an unintentional lesbian (because in order to successfully romance Sebastian apparently you can't swing around a little bit behorehand).
What am I trying to say...?
Ah, yes. It's mostly about the character for me. In my first play-through of Inquisition, I'm planning on romancing Dorian. I've firmly settled on a male Inquisitor first. However, despite the fact that Dorian is more physically appealing to me than Iron Bull, the Bull's personality (and voice actor) have given me cause to put him into a priority position for my first run.
Then again... I'm in love with Josephine so far. A refined, cultural woman who knows her way around a noble court? Yes, please. The only option (sadly not available) better to me would have been Vivienne, because I find ambition incredibly alluring. So will my first Inquisitor go for the fellow human, Dorian? Or, what are they saying, #ridethebull? Or perhaps even fall for the lovely Josephine instead...? Now that I think about it, a Pentaghast also sounds like a fine political match for a rising power player.
I'm more interested in the character's personality, and that will define who I continue onward with.