Children born to gay parents do as well academically as their peers raised in heterosexual household.
By mining data from the 2000 Census, Michael Rosenfeld of Stanford University has found that children of gay and straight couples do equally well in school.
According to the study nearly 7 percent of children raised by heterosexual married couples were held back a year, while about 9.5 percent of children living with adults identifying themselves as same-sex partners repeated a grade.
The difference between the groups pretty much vanishes when taking into account that the heterosexual couples were slightly more educated and wealthier than most gay parents, Rosenfeld said.
"The census data show that having parents who are the same gender is not in itself any disadvantage to children.
"Parents' income and education are the biggest indicators of a child's success. Family structure is a minor determinant," he said.
Rosenfeld's study shows that children of gay and married couples had lower grade-repetition rates than their peers raised by opposite-sex unmarried couples and single parents.
"My research makes clear that there's a huge advantage to kids to be out of the care of the state and into the care of any family, even if the family is not perfectly optimal," Rosenfeld said.
The findings were published in the journal Demography.