I read a bunch of articles
For example, claims that according to Muhammad, Allah prohibits anal sex.
http://wakeup313.blogspot.com/2013/03/allah-has-body-3.html this says that Allah has a body. So Muhammad told one of his buddy about that according to some hadist.
My guess is it's not in quran. If it is, then it wouldn't be "controversial" as the answers to those questions show.
So how come some things that is revealed to Muhammad, such as, "Don't have anal sex" doesn't show up in Quran.
Is Quran incomplete?
Did Allah send messages to Muhammad under 2 categories. Okay, this messages shall be part of quran. This one is not.