Lol girls never really date down. Looks they date up unless the guy is rich. Height they date up but that's understandable. Money wise they definitely date up. Body wise they date up unless the guy is rich. And when it comes to intelligence they will date up unless the guy is rich, really good looking, or buff.
I don't really think intelligence breaks down on a simple scale.
I've dated girls who just work retail, didn't go to university, but they taught me a whole lot of things about how to have fun.
I've dated a dancer who may not be so academically smart but watching her dance and practice and the passion she had for it was incredible.
And then I dated some women who are very intelligent with whom I could talk about academic subjects like history. Those the conversations were interesting but I actually wasn't getting that much that I couldn't with a good friend, and I kind of missed those girls who could be more playful and have fun and do stupid stuff with me.
So I really think it's more important to focus on whether you two have a good time together and some level of compatibility than trying to break down intelligence to a simple scale.