Since we just talked about the importance of being considered safe in another thread, I'll extend that here, because it's relevant.
If an XY human doesn't look "safe and normal", they will
never be approached by an XX.
We're all evolved to be in a kind of "trust but verify" mode, but XX's have more of that - with them there's what looks very like an
evolved assumption of risk.
(I don't know if it's evolved, but it appears that way).
In simpler terms: for normal guys (> 80% of the total) the default XX reaction is "avoid".
In order to overcome that you must, at the very least, be physically relaxed (
nothing in your body language that could indicate possible aggression), and have a "resting happy face" or a casual smile.
This doesn't come naturally to many Aspies. Our default body language is often "off" a little, and our default facial expressions tend towards all the "smiling muscles" being relaxed, with isn't welcoming to NTs.
Note that that's the absolute minimum to be considered. It's not
sufficient by any means.
Just looking at someone for a second with the "wrong" expression, or moving in a way that suggests the "wrong" kind of muscle tension, and you're off the list anyway
BTW - an XX with a "caring personality" might approach someone who doesn't follow these rules exactly. E.g. "Relaxed but the right kind of unhappy" might reduce the "rejection threshold" for them.
A viable scenario in your case: perhaps you'd just come out of a Yoga class (Yoga is
great for balancing and relaxing body muscles) and were wearing a happy smile due your feeling good about your new life and enjoying winding down from your Yoga class.
That combination would lower the "approach threshold" a
lot.