Interestingly enough, the first time I heard about herbivore men, it was in a news article (long before the Wikipedia article was written) that took the definition a little bit farther than that: according to that article, herbivore men are largely non-competitive in all aspects and have little to no interest in machismo or traditionally masculine pursuits. It specifically said that herbivore men aren't interested in chasing promotions at work or driving fast cars.

I wish I could find that article again.