Nothing that teens haven't already seen.
This movie really puts the main character's mother in a bad light, and for good reason. She doesn't think that her son can handle relationships or be independent. Nothing can be further from the truth. He overcomes adversity in the process. That says something good all by itself. This movie is mildly suggestive, and there is some swearing, but it's no worse and no stronger than anything teens have already seen. As for only teens liking it, I have something to add. I saw this movie as an adult when it first came out, and I liked it. That's because I have Asperger's syndrome. Adults with disabilities and/or challenges may like this movie too. Not great, but average and redeeming.