Hmmm... I think a few of you are missing it.
One of you mentioned that this IS a game, so you get to explore...options.
Well, my first serious character, I wound up keeping both Morr and Lel panting after my character, and it wasn't easy... at first. You have to figure 'em out. Clearly, you only have a few 'choices' for dialogue, but in some ways, it was surprisingly similar to real life. I don't suppose people would really like to know that they CAN be categorized and subverted as easily as a computer game character, but...
Leliana is really pretty simple. She needs reassurances. She wants to 'confess' for one thing or another, wants desperately to reform, wants to be a 'good girl'. Hence, the thing with flowers, wants to be a chantry sister, but wants to have fun... easy to subvert with silly 'girly' crap and sweet talk. She WANTS to believe.
The ugly thing about Leliana is that she is actually a lot like some girls... goody goody church girls. You know the type. Go to church on Sundays, very dutiful, but run off with a bad boy first chance they get. Leliana is all pretense.
Morrigan is the exact opposite of Leliana. She pretends to be 'nasty'. If you want to understand Morr, it's not 'goth/emo'. Not at all. More like Ayn Rand. Complete user, but pretty honest about it. There's no pretense at all. It's actually sort of refreshing.
Leliana is the girl that most guys wind up marrying. Morrigan is the mistress, who they leave their wives for, run to Mexico with, lose all their money, and wind up shooting themselves over.
Zevran is great. I say this, even as a het guy: when I played as an Elf Mage, I figured, well, why not? So, I went for it, covered my eyes during the 'love' scene, and followed up the dialogue afterwards. Hilarious.
Really, what's so bad about Zevran? He's a frickin' assassin. Lifespan is likely quite limited for this occupation, Zev himself admits that there's not much of a retirement plan... so, why NOT play the field? Anyway, most of his banter is just banter anyway.
However, I gotta admit... it may be that I'm a guy, and don't see it... but I do NOT see how any woman would ever think that Alistair is an attractive character. Bleh. He's so.... limp.
I mean, his big romance line is, what, 'Maker, you are beautiful'. What, that's it?!? If you're a female Warden, your job is to kill critters for a living. You would think the least Alistair would do is compliment your scars or something, rather than give you some limp peasant 'compliment'.
If you're a born homicide (isn't that part of the recruiting parameters for Junior Wardens?) you would think that silly 'flower-girl' speeches would just make you scoff. Apology? For what?