I gotta disagree about the "lacking in content" thing, the only romances with decent content were the M/F relationships, Leliana's F/F romance was especially bad when it came to that seeing as it was completely ignored apart from if you tried romancing someone else at the same time
Care to elaborate? The only real difference is some party banter. And if you don't use those characters you wouldn't notice at all. You will still get jealousy convos in dialogue as well as Alistair's idle gossip and Wynne's concern and Morrigan smiling for hours. Within Leliana's actual dialogue tree there is very little differences between sexes.
A quick look through her dialogue in the toolset indicates the following differences between sexes(minus whatever bugs there are):
You made me say all those things->You still like me right?
female:Oh, why am I being such a baby about this? I must be a sight, spilling my guts.
male:Oh, chivalry is so dead. Making the lady spill her guts like that...
This entire dialogue is female:"I... have I ever told you I really like the way you wear your hair?"
While male gets a few options when discussing female bards using the art of seduction, a couple of compliments when discussing shoes and can say "Those initiates can't have been more lovely than you." to start the romance
Also the forbidden fruit is slightly different
male:My... fruit? Well, it is not technically forbidden... b-but it's not freely given either! Not everyone gets a bite.
female:My... fruit? I... uh...
post Majolaine is the biggest difference but is bugged in game if I recall correctly and plays for both
female:And I... I think I have.->You are how she used to be, years ago--a joy to be around, a constant companion and a listening ear in times of need.->I'm not Marjolaine. Don't worry./I can only hope to one day be as special as she was to you.->Yes... I know that. I don't think you would ever do what she did to me./My dearest one... I think that day has already come and gone.-> I have never regretted leaving Orlais. I do not regret any of the pain, the anger, the loneliness, because it brought me to you. And I... love you. It's so wonderful to say that to someone again. Oh, but people are starting to look at me strangely. We will speak of this again, I promise.
male:Have you felt this way about another person?->Are we fishing for compliments? Yes, I would do anything for you. You've been there for me when no one else has.You are a friend and... and so much more. In spite of what has happened, and knowing what might happen soon, I am happy and life is good.