Regular name changer here! Although I could well be recognised by those in the know anyway, I am too angry to care!
Ds is 11. He is quite an immature and unstreetwise 11, and he also has aspergers. His Dad and I split up years ago, but most of the time we have a really good relationship. We completely co parent together, and I would say that we are actually quite good friends as well.
A couple of moths ago, I found out that ds had been watching Family Guy at his Dads house. I wasn't happy about it, but I've never really watched it so I didn't think I was in a good position to judge. So I watched it to see for myself. I still wasn't happy about it, but I figured the damage had been done so I chatted to ds about it and tried to explain some of it to him. He told me that he found a lot of it confusing, but he thought some of it was funny. I basically explained that the things he didn't understand we're mainly sex related jokes meant for adults, and tried to do it in a way that would encourage him to ask me about things he wanted to know. I knew his Dad was going to allow him to continue watching, so my approach was one of damage limitation.
Believe me, it really isn't easy to explain this stuff to a child with AS who doesn't like deep conversation at the best of times!
Spoke to ex about it, he says loads of 11yo's watch Family Guy, and I wouldn't stop my children watching a panto that has jokes aimed at adults in it. 
I asked him to only let him watch it when he was there so he could explain things that he thought needed explaining. I can usually trust his judgement well, and we would normally respect each others wishes about stuff like this.
Anyway (sorry, I know this is getting long) today ds came home with the Family Guy annual. It even says on the front that it is intended for mature audiences. I read a couple of pages after taking it away from ds, and it talks of bondage, pedophiles, sadomasochism, and that's just for starters!
WTF do I do about this? Ds understands why I have taken the book and why I don't want him to learn about things in this way, but I'm out of my depth, know very little about this stupid bollocks programme, and my ex is refusing to talk about it. He put the phone down on me when I told him I took the book off our son.
I'm not BU right?