In the summer when my boys are home from college we have a problem with lights on all hours of the night, doors left unlocked, sleeping all day when not at work, then rising in mid afternoon and spending the night out with friends, etc. On the bright side they do anything I ask cheerfully, went to visit Gettysburg with me and seemed to enjoy it,keep the cars filled with gas, and have a cheerful crowd of kids coming in all the time.

I would suggest the rules you make concern paying their share if resources are wasted.Like for example, paying some of the air conditioning bill (energy) if it's left on unecessarily, turning off lights, locking doors, keeping the cars in gas (not out of gas!), call before bringing a hoard of young folks in for pizza at 12 midnight, AND NO pornography in the house! I do not think at 22 you can restrict his coming and going. He IS a grown adult. But we will always worry, part of our makeup. Good luck to you!