I think I'm beginning to notice that all of the primary reviews on here are way over-the-top. Let me pinpoint some of the "displeasing" references in this game.
• Your sims can "WooHoo"- essentially, your sims can have sex. Which would be expected, considering it's a life simulation game. WooHoo consists of your sims going underneath the covers of the bed and making noise. The covers rustle, and little hearts fall from the sky, and your sims come out a few seconds later in their pajamas. Seriously, there is nothing terribly graphic about this AT ALL. Any child that is aware of what intercourse is, can handle this just fine. The only other sexual references found in the game are hugging, holding hands, flirting, kissing, making out, etc- ALL of which kids 10 and up should be able to handle.
• Your sims CAN get into physical fights. However, there is nothing graphic about this either. There is no blood, and no evidence that a fight occurred after it happens. When sims get into physical fights, the one tackles the other, and they basically roll around in a little dust cloud for a few seconds. They both get up, lose points on their little "friendship meter", and go about their day.
Keep in mind that the entire game is a life simulator- any content that you don't want your kids to experience, you can monitor yourself. If you're really set on not allowing your child to use the WooHoo feature, you can suggest alternatives (i.e your child can have their sims adopt a child, or they can make one using the Create-a-Sim feature). Remember that The Sims is all about life- chances are your child will want their sim to get a great job, live in a big house, have tons of friends, etc, and all of that is possible with The Sims 3! I've played it since I was 13 and it's one of my favorite games, the possibilities are practically endless, and it's a great opportunity for your child to experience their own creativity and ingenuity within the game.