Now, my kitties are largely indoor only. I would estimate they get to traverse to the fenced in backyard MAYBE once a week in warm weather, for an hour or two- and they do get anxious to go out again..but, I find when they don't go outside, after a few days, they forget about it..Why don't you try having someone else stand on the opposite side of the door, with a really loud noise maker, and a squirt bottle, and after a few times, I think they will stop wanting it so bad. But, if you continue to let them out, I don't know if it would ever work. Maybe more toys/attention, etc., inside?