Sims 3 dating problem, the other sim is unflirty?

So in the sims 3 these 2 sims really like eachother, but the other girl, who I am not controlling, has the unflirty trait? How can I get her to like my sim without using trait changing cheats?Sims 3 dating problem, the other sim is unflirty?
Tell jokes and then do any friendly/romantic gesture except for flirt and i don't need to tell you not to kiss or hug too early either. But start off with a friendly hug and also check her other traits. like if she like logic then play some logic games with her. the unflirty trait basically is a sim who likes to take things slow.Sims 3 dating problem, the other sim is unflirty?
lol sims get 1 lyfe play runsacep1

play chess against computer

spore