Well, as a man I can attest to the fact that it can be a real challenge figuring out what women want, and that's even without AS involved! Plus, in my opinion, one of the difficulties in emotional relationships is that needs and wants are not static but can be extremely fluid over time. Add to that the fact that most of us aren't completely sure what WE want in a relationship and you have a conundrum, wrapped in an enigma, blah, blah, blah...
Communication, as all the "experts" will tell you, is the key. Which would seem to be easier for aspies since we like to be direct and honest. But it doesn't seem to be. All you can do is try and let him know the things that make YOU happy and you would be interested in doing on a date, and ask him to be open with you as well. There are the classic events, like movies, dining out, sporting events, museums, concerts, which are usually "safe" and are things that most people at least won't DISlike, but once the relationship starts to develop more you'll want to find things you both enjoy, be it golf, sailing, reading to each other, rebuilding carberators or debugging C++ code. As to the physical side that someone mentioned above, well, guys will always want that (and most girls too even if they aren't supposed to admit it), but it's best not to rush things.
Just my $0.02 worth...
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Scientia est Potentia