cliff pretty much came out on that piers morgan interview.
without actually saying i'm gay I also wanted to add that some people have homophobic families.
I'm bi and I would never come out to my parents as I don't really get on with them and they don't agree with gay relationships they hate bisexuals even more.
some celebrities are also advised by managment not to risk it.
the saddest case was luther vandross who according to sources was desperate to bring partners on to the red carpet.
It's even harder for black celebrities.
I think that is why Dec doesn't come out due to his family.