I want to ask someone, "Describe the perfect girlfriend/boyfriend" but I don't want to be so hetero-normative. So I'm looking for a simple gender-neutral/gender-inclusive equivalent for boyfriend/girlfriend, like 'spouse' is for wife/husband.
I can only think of:
- Significant Other (SO)
- Partner (not the best for just dating, though)
Those both feel kind of stiff. Are there any others that I'm not aware of, possibly more casual? Particularly ones that would be easy to explain to non-native English speakers?