The Sims 3 (much like the other Sims games) are all about making choices. The three top choices are you can choose to be an academic, focusing not on boys but on school, you can choose to focus on athetism, or the most popular is that you can choose to be extremely romantically involved. I tend to use a mix of the three, but I must admit that having romantic traits such as "Great Kisser" and "Flirty" are fun to have since they can have relationships much easier, and it's so much fun to build relationships and to have kids. Some parents believe that the "woohoo" is too mature for most people but I disagree -- I started playing the Sims when I was 10 or 11 and I got what was happening, but I didn't think much of it. Any younger than that and they won't even really understand what's happening when flower petals are falling on the bed.
Overall I believe that this is a great game for ages 10 and up, even for adults, because it teaches responsibility, and just what happens if you don't pay your rent, or even if you cheat on your husband. Yes, there are cheats like "motherlode" but everyone of all ages knows that there aren't any cheats in life.