They're suspicious either way, considering the black-haired and rotund Robert Baratheon is officially their father.
Bigly.

It's actually better that Cersei had kids with her brother than some other guy. At least the Jaime/Cersei offspring's looks can be waved away with "They take after their mother". If their father was some
other
man that Cersei was knocking off, then their looks would be extremely suspicious.

The relationship caused trouble because it messed up the rules of inheritance whether Joffrey was the real king was based on whether or not people thought Robert Baratheon was his father. It would still have caused trouble even if Jaime was just some random lover, rather than Cirsei's brother. The incest just made the story more lurid.

G. R. R. Martin has said this story is based on the War of the Roses and Renaissance politics. If you know anything about that time then you know that there was a VAST amount of rapes, battles and backstabbing and all the bloodshed that comes with those historically speaking. There are few things bloodier than histories about that time period.
Freedom of religion means ALL religions not just your own.

Thanks. It just caught me a little off-guard.
That's one thing I don't like about GotT. It seems to push the envelope only for the titillation effect. It's sumptuously mounted (pun intended), but is it really that interesting? It's a long string of rapes and battles and blood-shed and back-stabbing. Not much to write home about.
Are you basing that assessment off of a few episodes of the first season? Because from your OP, it sounds like you just started watching the show.
If that's the case, then please keep watching, and stay off the message boards until you're caught up. There are several defining, jaw-dropping moments in the story and they're really best experienced without hype or advanced knowledge.
Personally I think GoT takes quite a bit of time to hook some viewers, and because the world of GoT is so vast and the show puts the onus on the viewer to pay close attention it requires a real time and attention commitment.
But after the show establishes the players, the game and the rules, it becomes one of the best TV shows of all time, easily. For what it's worth, the "twincest" wasn't invented for the TV show, it's a part of the original books and has a real impact on the narrative.
Bigly.

"romantic" LOL so cute

I think the concept of the show is to depict every possible romantic relationship that ever exists in reality, so I think it's not really pushing the envelope because it's already there. However, like you said, the problem of this show is that it focuses too much on inhumane behaviors which could leave a bad taste in viewers' mouth.

Thanks. It just caught me a little off-guard.
That's one thing I don't like about GotT. It seems to push the envelope only for the titillation effect. It's sumptuously mounted (pun intended), but is it really that interesting? It's a long string of rapes and battles and blood-shed and back-stabbing. Not much to write home about.
I'm not a woman much less Deanna Durbin, but the old-time glam-shot appeals to me.

Yes, that is one of the key plot lines of the Game of Thrones.. the illicit relationship between Jaime & Cercei and her children. If you are binge watching the marathon on HBO (or elsewhere) then you will see how the secret relationship effects others in the coming seasons.. and what the Lannisters do to people that pursue that information.

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That may be a small part, but it seems to me that Jaime is so completely in love with his sister, he seems to have stayed faithful to her, despite having every other woman throw herself at him all day.

Part of what's behind Jaime and Cersei's affair is they're members of a haughty aristocratic family and have been trained to think nobody else is worthy of them. The same logic underlying incest among the Egyptian Pharoahs (or, in the series, the Targeryans)

It's NOT different if that's why they are attracted. But if they are doing it for bloodlines, that's a lot different. These people have been twin brother and sister their whole lives. And I know this is 2017 and not some Middle Kingdom fantasy, but modern people have made decisions about what's worth exposing and what many might find good taste would rather leave behind. I think the Lone Star example and GOT examples are extremely different.
Mostly I think it's just shock value, which is why I hesitate to give GOT great kudos. A lot of it just just inflammatory garbage, even if it is well performed and well staged.
I'm not a woman much less Deanna Durbin, but the old-time glam-shot appeals to me.

How is GOT different? It's relatives attracted to each other. Jaime and Cersei say they have always loved each other.

There's a movie I like a lot called Lone Star. I can't quote the plot bible-and-verse, but I think Chris Cooper and Elizabeth Pena were attracted to each other as children, and CC still had a thing for EP as an adult. At some point, I think it becomes clear they may have been fathered by the same man. A friend of mine strongly objected to their being romantic, but I think, if they really feel strongly for one another over many years, I don't think being intimate with a half-sister who is actually representative of a different race and culture, I don't see what's wrong with that.
Now this has nothing to do with GOT and the idea of genetics and in-bred abnormalities, but I guess I'm just trying to say that I'm not freaked out about relatives being inclined toward one another. The GOT thing is a different subject entirely.
I'm not a woman much less Deanna Durbin, but the old-time glam-shot appeals to me.

No, just making social commentary. I don't like incest any more than most, I'd imagine. Just wondering if social justice types get upset at anyone being negative about brother-sister incest.

Well that's a response I didn't expect. I just wanted to get the story straight.
It was merely a question. Sensitive about a sensitive subject, are we?
I'm not a woman much less Deanna Durbin, but the old-time glam-shot appeals to me.

Yes it's incest, but this is 2016 after all. And it's hateful to try to say something negative about alternative sexuality. You should not be an incestphobe.

You are incorrect in your title. It is TWINcest.