DH is a manager in a store with lots of female staff. He started on the same level as them but has been promoted above them.
In the early days he became friends with all of his colleagues on Facebook and is still friends with them now.
There are 2 women who put up posts every couple of months, tagging each other and DH, to announce to the world that 'Everybody has that friend that can turn any conversation into a dirty one' 
I have explained that it makes me uncomfortable with this being regularly advertised on his wall, to all of his family and friends. Our teenaged children are friends with DH so obviously see these posts too.
Would I be unreasonable to ask that he deletes these colleagues as friends? This is clearly not a professional relationship of manager and staff.