WhatsMyName said:
I would've thought GL would've edited that out in the SE's since Leia and Luke are siblings. Don't you think the thought went through Luke's mind after he realized Leia was his sister: "HOLY SHIT! I made out with my sister!"
I don't have a problem with that.
Sure it's a consequence of making things up on the fly but put yourself in the their position.
When the meet they are in their late teens.
Even beneath the veneer of a Rebel Princess and an idealistic young hero pulses a mess of hormones.
The two are genetically similar but lack the social conditioning to kick in the sense of repulsion which usually stops incest from happening.
They have the hots for each other but don't actually do anything about it because they are too busy acting responsibly in a war situation.
When they both discover they are brother and sister they act like mature adults and just don't talk about it (you can imagine them re-contextualising their friendship alongside their sibling affection off screen but not in terms of "I can't believe we actually snogged").
Fantasy needs moments of verisimilitude like this to work (even if it isn't planned).
What's jarring is having a really mature subplot revelation (which sits in the atmosphere created by the first two films) penned in with Ewoks, burping aliens and fourth wall breaking Tarzan yells.
It's the beginning of the schizoid identity crisis which follows all the way through the PT (with it's juxtaposition of poo-poo jokes, cartoon characters, stagy senatorial scenes/council sessions and quite graphic violence).
Speaking of verisimilitude, the Luke/Leia situation has it mirror in the little Anakin/young but older Padme relationship in TPM.
Anyone who has been around children will tell you, little boys of Anakin's age are generally icky around girls, they don't like them near them, they don't want to play with them and they definitely don't develop crushes on them.
If he was to get a crush it would be on someone older, when I was his age I was all :

And

Girls of Padme's age would see a boy of her own age as being as mature and as interesting as a boy of Anakin's age.
A more realistic story would be Anakin and Padme both obsessing over Obi-Wan but for different reasons.
Anakin because he gets to go into space and play with laser swords and Padme...because...well....

Qui-Gon and Jar-Jar just get in the way of proper human plot development.
You already have the seeds of a more interesting PT there.
Come AOTC, Padme being a genuine politician and an intelligent woman would continue to fancy the pants off unobtainable Obi but try and be sensible about it.
Teen Anakin (who never gave a moment's thought about Padme as a kid) would suddenly get all hormonal over her but get insanely paranoid that she fancies his guru thus shoving a wedge between them and their friendship.
The TPM dynamic would be more likely to work if you swapped Padme and Anakin's ages.
That way Anakin would look at Padme as a nice little girl and Padme would look at Anakin as a 'dreamy' sexually non-threatening older boy (like Marion and Indy but without the creepy sex stuff).
That's what being a child and a teenager is like (generally).
Star Wars works when it's real people (or as good as) in a world with flying cars and lightsabers.