Malvineous:
The point I was trying to make is that in general, it seems like men have a narrower list of qualities that they find sexy in a partner, while women generally have a wider range of things they find sexually attractive beyond purely physical. It's not about who you would date, but what turns you on. Your example of a woman who only likes 6' tall men is an exact comparison, but that's because the woman's list of turn-ons is also very narrow, which I think isn't very common for women. What I was trying to do was think of some common answers I've heard for what women find attractive beyond just looks (sense of humor, etc.), and come up with a scenario where ALL of those qualities disappear at once. Perhaps I made a bad analogy, but I'm struggling to think of a different one that still illustrates that point.
My personal definition of shallowness has nothing to do with what someone's attracted to, no matter how specific. I think shallowness comes in when someone values sexuality above anything else in a relationship. So to make another strained analogy, you could have a guy who's only sexually attracted to 4' tall rodeo clowns, which is super specific and rare, but if he cared the most about personality and family values in his rodeo clown (and is even willing to bend some on the sexual side so he can find someone), he wouldn't be shallow in my opinion. However, you could have a different guy who is attracted to women of all heights, sizes, races and ages, but he doesn't care about anything else, he just wants a hot girlfriend and nothing else matters to him, that guy would be shallow.
I think your definitions might be strained, there, but that’s ok. There are certainly variations on “shallow”, too. It’s a spectrum. Being attracted to tall men is shallow, but normal. Breaking out the tape measure on the first date and leaving an otherwise pleasant date if he’s not 6’2” is a different story.
I will say that women can be just as shallow as men, it’s just that male shallowness has been excused a whole lot more over the years.
I would also say that if you’re not interested in a romantic relationship with a person unless they’re specifically eager to gain weight for your sexual gratification, it might be worth taking a time out and assessing what’s going on. That feels to me like the point where a fetish is causing harm, not enhancing your life. But maybe not!