Not too sure about that Carebear... I think my Aspie daughter could well be ENTP. It's not that she doesn't use an extraverted perceiving function, it's more that she's sorta perceptionally dyslexic, if you get my meaning? She uses it as much as the next guy (well, unless the next guy is me or someone with even more dominant Ne lol), but there's a mental block that prevents her from using it correctly. Or she just perceives different things to me, because she has different values and priorities. Just like I have a hell of a time using Se, not because I can't look outside of myself, but because I've spent most of my life just uninterested in the things Se has to offer; in a similar way, I think my daughter is just not interested in the sorts of things I use my Ne to see, and so uses hers to see other stuff.
That, and the social dyslexia thing. I mean I have known dyslexic people (worked with a help group once) who were Se or Ne dominant, and used it brilliantly in all things except literacy; could be that extraverted perceiving Aspies are similar, in that they use their perceiving function just fine, in all areas except social.