The first thing I looked at was aspiration. Personality and zodiacs were all identical and no turn-ons or turn-offs were satisfied.

A few conclusions can be drawn from this:

• Everyone loves their own aspiration; Cheese sims are obsessed with other Cheese sims.
• Other strong attractions will be seen with Family-Knowledge or Romance-Pleasure.
• The worst combinations are Family-Romance, Wealth-Cheese, Popularity-Cheese, or Pleasure-Knowledge.
• Romance is one of the worst aspirations for generating chemistry while the best are Family and Pleasure

I have just recently started playing FreeTime and I haven't tested multiple aspirations yet. My guess is that they will work just like primary aspirations. If two sims both have secondary aspirations, it will check all 4 combinations and sum the total.