How does sims 3 ask the other person's constellation?

First of all, you should get to know that person.

Then click on each other.

Choose a romantic one and sign one.

There seems to be something wrong with the translation.

But click this to know another constellation.

Of course, the relationship with the villain should not be particularly low, otherwise you can't ask.

Also, the compatibility of constellations also affects the relationship value ~