The Simpsons, first off, is not 14! It is PG, some, I think around 7 or 9, are rated 14, but the whole show is mostly PG! The Simpsons has some stuff that parents might find inappropriate... for 4 year olds! Okay, sorry, there might be some stuff that might be found inappropriate but I've watched this since I was a baby, litterally! (Yes I faked my age)
Some sex is included, but its mostly in the newer season. It's not that bad, and most of it is just, well, not bad. And sex is part of nature, why not get a head start! (Just kidding, but its really not that bad)
Now language, thats a different story. They say the h word, a word, d word, and somtimes the b word. They swear in every episode, but it's not like that many bad words are there much, but they cuss every episode.
Now violience is just like a regular cartoon, except blood apears somtimes.
Overall Simpsons is a great show everyone should watch.