Ok. So..let me get this straight.
Approaching directly may or may not work because an INTP would prefer to have some reason to suspect interest on the part of the party. However, from what Ive read, the stereotypical INTP is basically oblivious to romantic signals, and therefore is unlikely to "see it coming" in any case. On the other hand, actively attempting to lay down ground work before hand (aka courting, wooing, whatever) is seen to be tedious and incomprehensible, so they tend to avoid it. Thus one can neither seduce nor ambush an INTP unless, of course, you do.
I don't know what to do with this. Also, I think my head might explode.