If there is any romance between Viera it really has to be between the women, since the men just don't see anyone ever.

I suppose you could have childhood friends trying to keep up a relationship on the rare occasions they can see each other, or secret lovers meeting in the forest, but that's about the only opportunities for men and women to meet. (Or men and men for that matter.)

They may also just see sex as the practical thing you do when a man finally visits the village, whether you like him or not, and romantic pairings are a separate concept altogether.