Eh yesterday saw this chubby shorter guy with a very cute girl, and she was fawning over him and giving him kisses like she was love stricken with the guy. Overheard him just randomly talk to strangers and being social.
Don't get me wrong, being in good shapes makes things EASIER, but...so does being a social easy to talk to person. In fact I'd say being a likeable social person is more important, but if you're an autist, yeah, you need every advantage you can get, which is why I 100% support people who aren't very social, to, at the very least, become lean (you don't really need a huge amount of muscle. Just be lean and workout solidly for a year or two and you'll have a body attractive to 99% of women.). But you really need to practise social skills too. Luckily autists, though have trouble with intuitive social skills, are able to learn by listening, and paying attention to what others with good social skills do, and imitate them until that imitation simply becomes a natural flow for you. That's what I did when I worked retail, I literally would secretly watch my social co-workers talk and shoot the shit with customers/girls and just take note of everything about them. Their demeanour, care free attitude, what they talked about, how they responded to things, etc. and would slowly just literally copy them when I talked to customers myself. Took awhile before it went from feeling forced, to feeling natural once I understood what they were fundamentally doing, I could talk about anything, but still integrate those core social concepts. I still much prefer to hang around socially awkward autists though simply because they seem more like genuine people with genuine interests to me, and I try to help them a bit by giving them tips here and there for how to fit in better.