Signs do not attract Signs.
What you are calling "star signs" is actually only the Sun sign. Easy to find, so it is easy to sell, but only 2% of the astrological personality.
Astrological attraction is shown by "synastry aspects" between any of your 10 planets any and of the other person's 10 planets. These aspects indicate interaction which can be attraction, repulsion, harmony, or conflict, depending on which kind of aspect occurs between any two planets.
(aspects occur when two planets are a certain distance from each other, and the Signs do not indicate the distances).