What I think is really funny about this sign stuff in Sims is that in the original system of Sims 1 and 2, for example, Leo and Gemini were said to be incompatible, as in they would be repulsed by each other, but now supposedly they are compatible where they are supposed to be attracted to each other, according to the new system they invented for Late Night, from what I've gathered.
So I guess it just goes to show how hokey astrology is in real life, and without an official guide for the game printed by the developers spelling out for us which signs are compatible or not according to their own personal whims, there really is no way for anyone to figure it out on their own.
Which to me is kind of annoying, because now I have to search on the Internet to make sure that my two sims that I have had together since just having the base game are not going to suddenly become incompatible now because of their newly acquired sings that they were just randomly given after installing Late Night.
What a (removed by moderator), unless the signs don't actually make any real difference and are therefore pointless to consider.
And, by the way, (edited - mod discussing is against the forum rules -DS) Personally, I would not still be playing this game without it.