OK my college-aged daughter and her boyfriend had been in our house every night for about a month. My wife have some rule about not doing it when one of the kids are home and one is ALWAYS home.
I finally put my foot down, do some talkin, they are in the basement watching some movie so I tell her how quiet we can be.
At one point my wife and I just had to bite the bullet and just start to take care of business while the kids occupied themselves in the house in the evening. At some point their not all going to be asleep or out of the house at the same time.