As the nation experiences an unprecedented increase in unwed motherhood, more and more men are finding themselves named as "fathers," for purposes of child support, simply because of their ability to pay, say several recent studies.

It's called "paternity fraud," and one state that examined the problem found as many as 30 percent of those paying child support were, indeed, not the biological fathers of the children being supported.

Even when men are able to prove they are paying support for the children of other men, the courts and state agencies often force these non-fathers to continue payments .