I wouldn't make an attraction system to complicated. If you add to many options it may make finding a sim who meets your sims attractions harder. It shouldn't be that hard but also not that easy. I think focusing on trait is the best option even if their aren't a lot of them since you still can get a good variety of compatible/incompatible traits
Compatible
Creative/Music Lover
Creative/Art Lover
Geek/Genius
Genius/Bookworm
Self Assured/Outgoing
Outgoing/Insider
Evil/Mean
Evil/Kleptomaniac
Goofball/Cheeful
Goofball/Childish
Neat/Squeamish
Slob/Lazy
Snob/Materialistic
Outgoing/Dance Machine
Ambitious/Perfectionist
Genius/Perfectionist
Active/Loves Outdoors
Snob/Self Absorbed
Incompatible
Active/Lazy
Cheerful/Hot-headed/Gloomy
Goofball/Snob
Flirty/Unflirty
Foodie/Glutton
Ambitious/Lazy
Childish/Snob
Childish/Evil
Childish/Hates Children
Evil/Good
Good/Mean
Good/Kleptomaniac
Lazy/Neat
Loves Outdoors/Squeamish
Squeamish /Slob
Squeamish /Glutton
Slob/Neat
Family Oriented/Hates Children
Family Oriented/Non-Commital
Loner/Insider
Loner/Outgoing
After traits I would go hair color and eye color. I also feel like an attraction system would be a great chance for them to introduce likes/dislikes but just simple things like radio stations, TV channels, and color since most items in CAS/BB have a color tag. This would also make it so that a sim will be happier when watching, listening, or wearing something they like and upset when the opposite is done.
