There is no drug use in Fallout 3. We don't see it and the drugs aren't even bad for you. I don't count people smoking as drug use.
There is pretty clear drug use. True we don't see people "doing" the drugs. But there are clear references to drug habits and the like. Ex. Leo, Snowflake, raiders are also hopped up on drugs.
We never see people actually doing drugs in New Vegas either. There isn't an animation for it.
Slavery, not so much. If you could only enslave one race of people, than that might not be for teens.
Why would that matter? Slavery is slavery, regardless of whether or not it is a specific race.
Swearing? There is like a handful of swear words in the whole game. Cassidy in New Vegas says more swear words in one sentence then all of Fallout 3 combined.
I honestly can't believe that. I've heard quite a few swear words in Fallout 3.
There isn't even six. You pay a woman that is fully clothed to sleep next to you. Wow that's provocative.
Sadly its generally provocative enough for American audiences. The soliciting of prostitution that is. Of course there is also minor references to prostitution, [censored], and six within dialogue.
Enslaving people came with a DLC I believe
No its there from the beginning. Slavery is actually more present in Fallout 3 than in New Vegas, in that the player can actually participate in it.
But is this really a debate on which game had more mature themes and is therefore better? I thought it was more about mature ideas such as concepts of human nature...not about which game had more drugs....
No, Fallout 3 is definitely not a game for 5 years olds.