I'm actually surprised Zac didn't include some sex addiction in that rehab stint. I have always heard there are very few nights where Zac doesn't end up with someone different in bed and this includes when he was dating Vanessa Hudgens. If she wasn't with him, someone else filled the space, including some of his co-stars from High School Musical.
When Zac walked the red carpet in Toronto earlier this month no one even bothered to ask him about rehab because no one knew. So when a celebrity says they can't do anything without the tabloids or paps knowing don't believe them.