Willard wrote:
But in person, it might make you more comfortable to just say "If I seem kind of awkward, uncomfortable or weird, that's normal for me - I have a form of High Functioning Autism".
Don't use the words Asperger Syndrome unless you pronounce it correctly, or all he will hear is ASS BURGERS, and that sounds wholly unappealing.
I want to put just a teensy spin on this and suggest: "If I seem kind of awkward, uncomfortable or weird, don't take it personally. That's normal for me. It's just the way I'm wired."
I wouldn't use "autism" or "aspergers" on a first date unless he pushes for details on this "wiring". The main thing you want to convey is that the behaviours that might seem rejecting of him (like not responding to his body language the way he expects) are just how you are. You don't want him to think "she really doesn't like me at all- she won't even look at me" when you think no such thing. "Awkward" is generic enough to cover all sorts of missed social signals while not making him think of the last Autism Speaks ad he saw.
I would save the actual terms "autism/aspergers" for a second or third date (if there is one) and stick with generic "awkward because that's just the way I am- it's not you". If you are going to be awkward (and perhaps you are), you want him to think "she's a little awkward" not "things were a little awkward between us- I guess this can't work out". Some guys can't deal with weird and awkward. Some guys find it endearing or even that it means you'll cut their own quirks some slack. But I would keep it generic at first.