And, as one last note, most men in the US are looking for a women who is *almost* as intelligent as themselves, which has done quite a bit to keep this PG female out of the gene pool. Quite a bit of that endeavor, she's done on her own. Intensity played a role.
I'm not sure about that. I think there are just so many factors that go into dating/marriage that it's hard to say. I never had that experience (and have dated men who I felt were both smarter than me and ones who were not). And I know many other women who were quite intelligent and had no problems finding guys interested in them (again with a range of intelligence levels). I do think that things like overexcitiabilites, perfectionism, social anxieties, and being an introvert play a major role, though.* Friends of mine who have struggled with dating always seems to struggled with one or more of those (and I know that they can appear often in the gifted population).
*ETA: I realized that came our wrong and I also want to add obvious things like a small dating pool (e.g. living in a small town) or simply bad luck can play a role here too. I'm sure that are also a million of other factors I'm overlooking but what I mentioned above seemed to happen often amongst friends of mine.
Also, putting off relationships because they thought it would affect their careers is quite common too.