How soon do you INVITE someone into your HOME?

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My son who is new in town, doesn't know anyone. He goes out to a coffee shop the other night and meets a young man around his age. They get to talking and find out they both like to play The Rock Band game that comes with the WII Game. So my son invites him back for a game. We were not home and so we were really surprised when we got here. It appears the kid is a nice kid and all that but it got me thinking. How quickly do you invite someone into your home no matter what the age? When I was young I was taught to never invite someone home unless I got to know them first and felt they were nice enough and even them I had to make sure they met my parents first before I could think of inviting them home when my parents weren't there. After all it was my parents home and they wouldn't want strangers coming in even if it was a kid and I don't mean like elementry school age but older. I was taught you need to trust someone before you bring some one into your home because you just never know if they are trustworthy people until you get to know them. I followed that rule into my dating years and all through my adult years thus far. Do you every think about stuff like that before inviting someone into your house? Did you teach your kids to not assume just anyone could come home with them after just meeting them? Certainly I do realize this is not a hard and strict rule because of course there are always exceptions to the rule. Do you think this was one of those exceptions for my son who doesn't know the area or this person to invite them home within the hour? We live in a high crime area and who knows, you know what I mean?