I know for a fact could that I could stay in here for months w/o feeling the need to go out, ever, so groceries once a week is more than enough "out" for me.
Every time we have something else scheduled, like a dinner with friends or such, I have to drag myself out of the house, even when it's been months since the last one. I have yet to reach the point where I really feel like seeing other people.
My wife, my music, my books, the gym and our cats.
And this forum. :P
Who wants to go out?