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So in AFFC, there's a bit where Arianne remembers Renly coming to Dorne and attempting to seduce him. It wasn't that successful.
"Arianne had accepted that as well. One year King Robert's brother came to visit and she did her best to seduce him, but she was half a girl and Lord Renly seemed more bemused than inflamed by her overtures"- AFFC, p471
What if the reason for her lack of success was that the king's younger brother was far more more intrigued with Oberyn- and the attraction was mutual? Arianne trying to reel him in with some sexy dancing, Oberyn playing sensual mind games with Renly, Oberyn's secret library of erotic texts, Renly being very confused by Arianne making a pass at him, the heat and languid atmosphere of Dorne