As I said there, the movie may have objectionable scenes --but asking people to sign a petition based on conjecture seems ask for quite a leap of faith.
That is particularly true whe the objectionable material has not even been viewed by those creating the petition. Instead, according to that page you provided, it is based on things like "According to sources on set." What sources? Who checked them out?
I find this kind of baseless rush to a conclusion almost as disturbing as I would sexual exploitation.