I never looked for one. Though if I did I'd look for marriage material. Basically good health, good personality, stable finance, likes home and children, can drive, manage money, make sound decisions...etc. Oh and be available. See I'm a practical sort of person and don't want to waste time. A partner need to be suitable for me to live with and be available and useful. Trust me, an aspie can really benefit from a kind and "normal" partner who's very useful.
It's more about friendship and cooperation, rather than romance. I don't about other aspies, but to me romance is not sustainable. I don't have enough emotions to make that a top priority.
If you're talking about sex partners then I don't have a lot to say. I'm bi and everyone I've been with has been wonderful. Maybe I just don't expect much. 
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AQ score: 44
Aspie mom to two autistic sons (23 & 22)