One thing I thought was interesting about DA:O is how each of the potential female LIs is almost the opposite of what you might expect.
Leliana is by far the more worldly and experienced of the two. She's lived an adventurous and somewhat scandalous life, hob-nobbed with the Orlesian aristocracy, has seen more of the world, and is no n00b in the romance department. She's had plenty of lovers in the past.
Meanwhile Morrigan led a relatively sheltered life in a swamp and is not that experienced in dealing with people not named Flemeth. If she found time for romance in her travels it couldn't have been often, given her relative seclusion from civilization. It's doubtful she even crossed paths with other people all that often.
Yet it's Morrigan who is the far more aggressive of the two, and the one (at least initially) who has a much more casual attitude towards sharing a bedroll with the Warden. Leliana will only get involved in the Warden if there is some emotional attachment first.
I wonder if any elven male Wardens romancing her got offended when she brought up rumors of elven men not being very well endowed though 
Wait..she actually says that?
That's hilarious.