"Paternity can now be verified by a simple test – but that doesn’t mean it should be"

[stevenleser]

8. "I find the notion of women 'tricking men into financially supporting someone else's children'..."

I seemed to remember hearing some stuff about how historically the number was fairly high but that it had come down in the last 40 years. Here is what I was able to find:

http://www.wisegeek.com/how-many-men-unknowingly-raise-children-who-arent-their-own.htm
A 2006 survey found that 1.7 to 3.3 percent of fathers are unknowingly raising children who aren't their own. The study found that dads who opt to challenge the paternity of a child are far less likely to be the actual father than fathers who are confident enough not to challenge it. The percentage of fathers who are highly confident of their child's paternity are not the actual fathers 1.7 percent of the time.

Here is a wiki on "Paternity fraud"
http://en.wikipedia.org/wiki/Paternity_fraud

http://www.nytimes.com/2009/11/22/magazine/22Paternity-t.html?pagewanted=all
A NY Times article that suggests that for men who are not sure about paternity, as many as 30% of them are proven right by DNA tests.
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I have no idea how accurate these are or the backgrounds of the authors.