It's a little more than a line or two. Children don't come up when you romance Merrill or Anders with a same-sex PC for instance... lol
What exactly did you want from them? How different should a person act around a boyfriend versus a girlfriend? I'm really curious. Personally, I don't see what the huge difference would be.
Yes, yes I want exactly this. I want them to behave differently around my Hawke depending on the gender. Otherwise, the gender is a purely cosmetical choice. As for how - well, I won't share my thoughts on that because I'm afraid I'm going to offend somebody. I'm a straight female, but I knew a couple of bisexuals in my life and what I saw was that they did behave differently around people of different gender. I don't know why, I'm just saying what I saw.
As for the lines - how much is "a little more"? Because Anders has only one line - at the very end, and only in mage ending. Merrill, I think, had a couple. I think I'm wrong in saying this about all companions, however. I'm pretty sure Isabela had more gender-specific lines.
So, yes, I just want my choice of gender to have more impact. I like roleplaying a woman. I like when the game world is acknowledging the fact that my character is a woman. With DAII I felt like it didn't matter until Anders spurted out this line about children at the very end and I was all like "WOW! You have finally noticed!!!"
And I think we are going off-topic. And straight into one of these romance threads. 