Do you guys prefer playing as the same race as the LI you pursue in that file or are more into interspecies relationships?
I'm a huge fan of interspecies myself. ^^ Thinking of romancing Dorian as an elf.
Considering I only play non-humans, and so far only humans and the occasional elf has been available to romance... No.
Since I love playing elves and there are more human LI's than elven, that kind of pigeon-holes me into the "elf/human" so-called "interspecies" romance. (Though my Elven Warden would like a word with you. "I may be elven, but more than that--I'm a person"). However, there's too much baggage between humans and elves to make the whole "interspecies romance" exotic spice seem appealing to me. Millennia of slavery and subjugation, continued systematic oppression, the very real fear of cultural decay and extinction for elves, the underlying problem that all children born of elves and non-elves are always non-elves, so if you care about your people's future then there's that guilt of possibly contributing to future lack of genetic diversity and possible extinction from too much mixing (which always stresses out my DA elves, no matter how much they love their human partner), and a number of other cultural and socio/economic differences.
On the very shallow surface, "interspecies romance" can seem very cute. Look more closely at the deeper historical, cultural, and socio/economic differences between races, and there's more to it than just, "Oooh, we're crossing boundaries and/or going against society by being together! We're such star-crossed rebels!"
Also: human Tevinter magisters enslaved elves for millennia and continue to this day, and you want to romance one with an elf? Okay...
EDIT: That's not to say I don't like romancing human characters, but I don't like it for the whole "interracial romance for it's own sake."