If you discount the metrosexual part, wouldn't that take Tsukune out of the herbivorous man category? Being "metro" is part of the identity of a herbivorous man.
I can see where you're coming from in regards Tsukune's love life. He's only going after Moka but he's not aggressive enough about it. He's also got 3 other fine females that are throw themselves at him but he's too nice to take advantage of the situation. However, doesn't the fact that he is interested in a girl and potentially having a relationship with her take him out of the label?
I've read some of the articles on Sankaku, but I guess I'm just not thinking Japanese enough to understand the whole herbivorous male thing
It's funny that most of those articles on Sankaku make it seem like most of the Japanese male population are otakus or NEETs and, therefore, unsuitable for dating leading to the whole herbivorous man/carnivorous woman situation.