Some are yes, and I'm basing that on posts on other forums from users with Asperger's who say they are, but I think for the most part, no. My tendency is to say that adult males generally are not. I know I am not so much, and the one son I have who is most Aspie, is definitely not. Though out of my two other Aspie sons, one can be sometimes, to the point of it being kind of aggravating. He is 15 now. My youngest is extremely affectionate, but he's only 12, and acts very child-like almost all of the time. I have a feeling both will outgrow it and become more like their non-affectionate brother, but only time will tell. I was when I was fairly young still, but had pretty much stopped being so, to the point of being nearly totally non-affectionate, by the time I was sixteen.
My wife, who is also somewhat Aspie, but not yet diagnosed, tends to be less affectionate than most women I've known.
So far, the only people I've spoken with that are Aspies, who do claim to be overly affectionate, have been women on forums. I've not yet spoken to any Aspie men who claim to be.
Until now...
This is all only from my own observations, but clearly the answer is "No," not ALL Aspies are affectionate. Far from it in fact. Most, I think, are not.
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I'm not likely to be around much longer. As before when I first signed up here years ago, I'm finding that after a long hiatus, and after only a few days back on here, I'm spending way too much time here again already. So I'm requesting my account be locked, banned or whatever. It's just time. Until then, well, I dunno...