Nami never showed any romantic feelings, tho she is a little bit more vulnerable around Luffy but that's because she trusts him to fix any issues she is facing (Arlong, Robin or Sanji). It's not romance for me.
Oda is not drawing a romance manga and the few instances where we have some romance are more like comedy scenes.
And all the weddings we have seen since Thriller Bark? Reasons? Why did that became a recurring element in this story.
Actually the amount of couples shown and the amount of romantic topics in this manga has been increasing ever since it started.
And this story was also called Romance Dawn at first, always featuring some kind of Nami, even down to Monsters. Though the third version, in Romance Dawn v2.. She has blue hair.
Nefertari Vivi takes after her mother. King Cobra (a snake), he has black hair...
Nami's favorite food to cook is Peking Duck with Tangerine Sauce. Not her favorite food to eat, Oda made a clear distinction between those items he mentioned for every Straw Hat...
Nami also has an awful lot of twins in this story, that are always paired with a counterpart of Luffy.. Like Sabo and Koala, Ace and Isuka (novel), Pudding and Sanji, Monet and..
Doflamingo/Caesar Clown. In case of Shirahoshi and Rebecca, it is outright Luffy himself.
There is also an advertisment for a series of One Piece short-stories targeted towards female readers, with romantic themes, of course. It features Nami wearing the Straw Hat and hauling a kiss, with the text:
"Please enjoy the little ONE PIECE that exists in the margins of the great adventure."
Written and drawn, even signed by Eiichiro Oda himself, of course. So what is the little One Piece, with that artwork in context? It's Love!
There's also an early color spread that shows Nami and Luffy on each side completely seperated, doing their own girl/boy things, whereas Usopp and Sanji are on a couch in the middle, one of them holding a sign reading "Goal?". Gay Zoro is sleeping as he is not interested in this stuff, probably also making a parralel to the readers.
The entire SBS is a descend into pervertism. Oda has a high libido and he is certainly romantic, the romantic scenes like the finale of Drum Island are the highlights of this entire Manga.
Since today is Luffy's birthday, I give something away:
The truth is hidden behind alot of established thought taboos. The aromantic and violent nature of men makes them unable to see truths in this manga! Did I mention that Oda constantly stresses that men are idiots? It's because he's proving this true time and time again when they fail to see anything! Oda is a sexist, just not the usual kind...
Happy Birthday Luffy <3