Open door policy. That included my room and the basement.
However, my parents never really allowed us in my room because all that was in there was my bed, desk, etc....so there was really only 1 thing that would probably happen in that room.
our family room was huge but all that was in there was the TV and fireplace.
Our basement on the other hand was fully finished. A pool table in one room and a futon/TV/DVD player/Nintendo in the other room. So we were allowed to hang out down there. The door stayed open. But my parents would come down or send the dogs down (who would jump all over us) if it got too quiet. They would also just come down to get something. My dad was good at this becaus ethe basement also stored his library of books so he was always in and out of there looking for books.
We had the big house with a huge backyard and always lots of food (snacks and meals)....my mom had papa johns on speed dial! No one wanted to risk losing out on that!
Apparently pizza, snacks, and homemade brisket and kugel on Friday nights was enough to make sure we all behaved ourselves. It cost my paretns an arm and a leg in food but it worked.
Now, we can't say the same thing for other houses but...well....they never have to know about that
However, at 22 my dad still doesn't want me to have guys in my bedroom at school. My roommates and I each have our own bedroom in a townhome and a full living room adn kitchen.
The living room did NOT come with a TV and my parents weren't planning on buying one but all I had to say to my dad was..."well that's fine....If I have any guys over to watch baseball, we can always just watch it in my room where the only place to sit is on my bed"....yeah that got me a TV VERY quickly...haha....however, my bedroom still gets more use than the living room...he just doesn't "know"....dads never change