Exactly what I was getting at, and actually what I was basing the assumption on. As you may be aware, the Kinsey scale (which I don't agree with 100%, but it serves well as an example) describes this situation.

In looking it up again now, I was drawn to a particular line from Kinsey:

The living world is a continuum in each and every one of its aspects.

Unfortunately for humanity, continuums are not really very practical or intuitive (it would seem), and so I think we try to make do with approximations of reality. It's like trying to categorise certain music into genres. Sure you could call that one song "Nu Post garage-hop chillstep", but then the entire idea of classification starts to lose its value, as you aren't creating much more order than there was before. (I don't think this metaphor applies perfectly to sexuality though, but the idea is there)

P.S. I like the idea of the different levels of abstract thinking because it infers that there is a continuous spectrum of understanding OF a continuous spectrum. Anyway, rambling again, I should go to sleep.