I still remember on my playthrough with a male Hawke I noticed they'd made Anders bi (or with relative sexuality as the wiki points out) and when I came across this in act 1 I was at that moment like "Ah...okay, cool I guess." And I was sorta teetering on wether or not I'd go that way, but...being completely in the dark as to who was romancable and not, I figured 'let it wait a bit - other fish in the sea.'
It turned out absolutely hilarious that I chose to pull all the stops with Aveline, but in the back of my mind I was half-expecting that this was a 'dummy romance' and yep heheh...sure enough it was. But hey...just after that I complete Anders' companion quest in the 2nd act, choose the middle teasing response and get surprised. So by that time I'm thinking "Ah what the hell, let's give this a go and see where it leads."
Turns out I didn't feel nearly as awkward as I thought I would and, even more importantly, it led to the finale being twice as hard for me to go through than it would've been otherwise. If I hadn't romanced Anders I would've probably just told him to scram or even have killed him...but like this I couldn't, in good conscience, do either of those. That romance actually affected my decision at that end in a way I really did not see coming.
And even now, because of all this, I have a very hard time imagining my 'personal canon' DA2 story as anything other than inclusive of a gay romance with Anders. And if it managed to achieve *that* kind of effect on me, then all I can say is - thank the Maker Bioware chose to do it the way they did. Because if they hadn't, it'd still be memorable...but not half as much.