How serious is Paternity Fraud in Marriages ?

Yes, I did. But I am a Biologists and that **** comes natural to me.

I know the data from the UK showing the amount of cuckoldry, and I have always wondered about here.

"These results marry comfortably with DNA estimates of misattributed paternity from samples that cross a broad range of societies which suggest the rate is between 1% and 3%, and with Prof Gilding’s estimate of between 0.7% and 2%.

The number of children whose biological father isn’t their social dad is probably far smaller than you’ve been led to believe, although the 30% figure seems to be a zombie-statistic that refuses to die.

But even a 1% rate of misattributed paternity still adds up to millions of individual children, world-wide, each part of an interesting, sometimes tenuous and often heart-breaking story."

Periodically people try to do DNA testing on newborns. A couple of years a go two college groups tried this. Their number of participants, the duration of their program, and their location in a college town, all make the results more anecdotal than factual. They both found that in almost half of their tests, the father was someone other than the name on the birth certificate.

I have no idea what the statistics are here in the States, but if a wife has another man's child during a marriage, the law sees that child as a child conceived of that marriage, unless paternity is proven otherwise.

No one knows how prevalent it is.  No, I've never done DNA in my marriage.

What is "some paternity fraud?"  That's like being a "little bit pregnant."  It's either fraud or it's not.

Nope, all my boys look like me and I don't have any daughters.

In the UK the figure is actually one in 25 (https://www.theguardian.com/society/2005/aug/11/ch... and in the US guesstimates set the figure at one in ten. But we have no such ban on private DNA testing in the US so people should be less likely to do this in the future. I didn't need to DNA test my kids because I know who their father is (and they're both his little "mini-me"s in appearance anyway).

Without data it's impossible to say.  Would be interesting to see if it's relatively rare or a lot more common than we think.