Hahaha cats will always be outside cats and if they are trained or loved enough at home they will come back to you. They need their everyday outside running around crazy moments. But if you want to keep him at bay for more time then put things he looks for outside inside. Watch the curious george episode where the cat belonging to the italian chef keeps running away and the monkey gets and puts things the cat likes from outside inside so that the cat wont run away to look for those things
What age would you LET them start going out? My first cat just suddenly started slipping out the door, but I dont remember how old she was. Now my 2nd...I'm wondering b/c she's so young but already showing interest.