I think, considerations of physical attractiveness aside, both genders like to date people who are different from the crowd in some way.
I only know 1 other autistic person other than myself, so I cannot speak with any authority given the extremely small sample size. She is fairly attractive, and has all the typical AS traits (awkward in large groups, can't stand sensory overload), and seriously all the guys are queuing up to chase her. She can play the violin well, is intelligent, but is always a bit of an oddball which I, having AS myself, can identify with.
I can conclude that the guys like her because she's special, and they all know it, even if they don't know it's a side effect of her having AS. I reckon it's her uniqueness that is attractive, because there are lots of girls physically more attractive than she is yet don't have as many suitors, so perhaps we may discount that as a variable. My pet theory is that she's different from everybody else, and in a different way. If you think about it, in a college environment (where I observe and draw my conclusions from, so take selection bias into account), everybody wants to tweak their image for maximum cool, so everybody kind of ends up being the same kind of different.
Here's where autistic people stand out: we're different not because we try to be, but because we don't know how to be the same. Maybe that's one point for us, then. (: