If you have a familly and you are happy, you might not want to know this.
Apparently one kid out of every 3 is not from the husband. If you are a married guy and you have 3 kids, chances are one of them is not yours.
I dont remember where the stat came from, so feel free to ignore this.
But for myself, no matter how much I thrust the girl, the kid is getting a DNA test. My present girlfriend knows this and she is quite fine with it.