That sounds totally radical to the extreme.
So... no total strangers? Come on! Loosen up!
I think I mus agree with wes, total strangers are the bes. When total strangers are aroun you never know what may go down.
Last time I had a total stranger in my house he stole my camera. If you know someone good enough cool. Bring them. If not do not!
I'll be sure and strip search any strange girl I bring.