Another thing is that our friends loved to stay at our house because our parents were "permissive", and only later on did we find out my parent's real intentions: keep your friends close, and your enemies closer!...with all the kids at OUR house, they KNEW what we were up to!!!

LOL! I must admit, I am guilty of that! DS has a few friends whose homes I would never let him spend the night - but they are welcome here - under DH and I's watchful eyes. Although it does get old seeming to always have a house full of kids - I would much rather them be here, where I
know what they are up to than somewhere else where the parents have
no clue what they are up to!
I don't think we are even much more permissive than many of the other parents, but I think the kids feel more comfortable around us vs. other parents just because we are a lot younger, and can relate to them more about things like music, movies, fashion, etc...