Homosexual Intellectsexual seems to imply more intelligent about the same kinds of things. This may be based on the Seven (or is it Eight) Intelligences, Myers-Briggs, or whatever. Heterosexual Intellectsexual would then be people intelligent in different ways.

Two iNTp Rational Architects would be HomoIS. An Interpersonal Intelligent and a Intrapersonal Intelligent would be HeteroIS.

Of course, fnordian's definition is equally valid. There might even be a way to fuse the two (three?) into an easily-spoken term or acronym. Any ideas?