Louisiana has this requirement as well as I found out last year when I visited.BTW, in Arkansas you are legally obligated inform a resident before entering his or her home with a concealed weapon. As far as I know, only Arkansas has such a requirement.
"The provisions of R.S. 40:1379.3 (N) shall not limit the right of a property owner, lessee, or other lawful custodian to prohibit or restrict access of those persons possessing a concealed handgun pursuant to a permit issued under this Section. No individual to whom a concealed handgun permit is issued may carry such concealed handgun into the private residence of another without first receiving the consent of that person."
Taken from here: http://www.lsp.org/handguns.html#prohibited" onclick="window.open(this.href);return false;
A friend of mine who had mentioned he would like to go to range sometime, was unaware that I had a CHL. I made the mistake of telling him that I always carry. He asked if I am carrying right now, as in, in his house without him knowing. I said yes, and I have carried everytime I've visited. He seemed ok with it at the moment but a few days later he told me he's not comfortable having someone with a gun in his house and asked that I no longer bring it in his home. Needless to say, I no longer visit.
I no longer tell anyone I meet that I carry, unless I glean that the person carries as well.