I have Aspergers Syndrome. Sometimes we can appear to be very outgoing, but only in situations where we have confidence. As @ParaParaYukiko said, we can seem inappropriately outgoing. We generally have great difficulty “reading” nonverbal social cues and following informal social rules. Sometimes this manifests as being inappropriately affectionate, but more often (at least in my experience) a tendency to avoid rejection by disconnecting from informal social contact.
This can be especially true in dating. Total rejection had caused me to stop trying by the time I was in my mid-teens. For over twenty years, I just avoided any informal contact with women. Looking back on it now there were probably several women who were sending me all the “signals”, but I either couldn’t “read” them or ignored them for fear of getting it wrong and acting inappropriately. When I was in my twenties, the issue of sexual harassment became important. Since I couldn’t tell what was appropriate or not, fear of being accused of that was added to my fear of rejection.
I didn’t date until my late 30s. I met a lady under very unusual circumstances. She was very perceptive and understanding; realizing that I needed to be told exactly what she wanted me to do. We were married five years later. Meg later diagnosed my condition as AS while a psychology undergraduate. Her professor confirmed it, I had no idea what I had prior to that, I just thought of myself as a social loser.
It takes a very special kind of lady for a guy with AS to have a relationship. We tend to be good providers, fiercely loyal and, when shown exactly how, pretty decent lovers.