Two types of females?
In my experience, some women keep making the wrong choice of male - picking someone healthy and strong, but egotistical and aggressive. To forst approximation, these women are the "bumb blondes" (regardless of hair colour)
Other women pick geeky-looking guys whose brains they like.
Or maybe it's the guys of which there are two types. We all like the *look* of a supermodel, but I couldn't *live* with one!