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Most studies compare long-term lesbian or gay families (not average l or g families) with the average American family (incl LGBT families?), not with IBFs.
“intact biological family (IBF for short). Most gay parenting research compares gay and lesbian parenting to single, divorced, and step-parent parenting, or conversely compares a select, and often socio-economically privileged, population of gay parents to a broad, representative sample of the general population.”

Two new peer-reviewed studies show that family structure matters and children do best when reared by their married biological mother and father.

The widely circulated claim that parents engaged in same-sex relationships do just as well as other parents at raising children—a claim widely known today as the “no differences” thesis—is not settled science. Two new peer-reviewed studies released this week by the academic journal Social Science Research challenge the claim that there are no differences in outcomes between children raised by parents who have same-sex relationships and those raised by their biological mother and father in intact, stable marriages…

 

Contrary to recent and widely circulated reports that there is no sexual victimization in lesbian households, the NFSS found that, when asked if they were ever touched sexually by a parent or other adult, the children of LMs were eleven timesmore likely to say “yes” than the children from an IBF, and the children of GFs were three times more likely to say “yes.” The children of IBFs were the least likely of all family types to have ever been touched sexually: only 2% reported affirmatively (compared to 23% of LMs who replied “yes”). When asked if they were ever forced to have sex against their will, the children of LMs were the worst off again—four times more likely to say “yes” than the children of IBFs. The children of GFs were three times more likely to have been forced to have sex than the children of IBFs. In percentages, 31% of LMs said they had been forced to have sex, compared with 25% of GFs and 8% of IBFs. These results are generally consistent with research on heterosexual families. For instance, a recent federal report showed that children in heterosexual families are least likely to be sexually, physically, or emotionally abused in an intact, biological, married family.[7]