IMO, this comes down to common courtesy and respect for your host. There are plenty of folks on here who would allow the host to cut off their right arm before leaving the gun in the car. For those, I would submit, there is also no way in hades you would befriend someone who is anti-CCW much less enter their home.
We do not need to set of rules posted for the OP. He KNOWS they do not want them there. I am sorry but it is their roof, their rules. Do we really need to be acting like weasels (forgive me the name here but this is what it feels like), insisting on specific posting, specific signs, or for the homeowner to go through a legal punch list before entering their home? Remember these folks ARE your friends. Can we not just respect their wishes OR simply refrain from entering their homes?
Don't get me wrong, I CCW in my home, almost everywhere I legally can. I would welcome my friends who CCW into my home without an issue. My children have been taught about gun safety and what not to do and know the severe repercussions that await any of them who act unsafely. An anti will not have taught their children in such a manner.
I have friends who are not anti but ARE nervous around guns because of a lack of experience. I am working on them with that and I am betting within a year they will be carrying as well. Until then, I refrain from carrying in their homes. Yes during the time I am unarmed I have a heightened risk, IMO though, the friendship is worth that risk and showing respect and consideration of my host is as well.
It is a personal choice for me and a matter of ethics. Not saying those who do not share my opinion are unethical but you simply do not play by the same rules as me.