"Anyone of any sexuality can enjoy romances in this game." There are two flaws here:
a) "Enjoy romances in this game," fuck, no. Very, very few video game romances in this world are worth *shit*, if you enjoy Bioware's it is entirely likely that you also enjoy shoving your dick in hypodermic needle disposal containers.
b) "Anyone of any sexuality." Look, honey, if the characters need to have man-parts or even be heterosexual for you to enjoy a solidly written romance, you've got deeper problems than video games not catering to you. If a straight romance doesn't catch you, either you are dense, or it's a poorly-written romance, and, subsequently, if a gay romance doesn't catch you... Same thing. I don't enjoy reading a quality romance because it is bisexual (just like me omg omg omg!!111), I read it because it's GOOD. I don't let the Western concept of gender/sexual inequity impact my appreciation for something high-quality and expressive.
There are certain plot devices and character types that a heterosexual romance would be unsuited for, and vice-versa; it's not a matter, to me, of *forcing* a "gay" character in the game, it's creating something cohesive and believable, in the setting and for the characters, and Dragon Age 2 has dramatically failed in that regards.