It does, yes.
Here's an article about it.
Homosexual Parenting: Placing Children at Risk
Issue No.: 238
by: Timothy J. Dailey, Ph. D.
A number of studies in recent years have purported to show that children raised in gay and lesbian households fare no worse than those reared in traditional families. Yet much of that research fails to meet acceptable standards for psychological research; it is compromised by methodological flaws and driven by political agendas instead of an objective search for truth. In addition, openly lesbian researchers sometimes conduct research with an interest in portraying homosexual parenting in a positive light. The deficiencies of studies on homosexual parenting include reliance upon an inadequate sample size, lack of random sampling, lack of anonymity of research participants, and self-presentation bias.
The presence of methodological defects--a mark of substandard research--would be cause for rejection of research conducted in virtually any other subject area. The overlooking of such deficiencies in research papers on homosexual failures can be attributed to the "politically correct" determination within those in the social science professions to "prove" that homosexual households are no different than traditional families.
However, no amount of scholarly legerdemain contained in an accumulation of flawed studies can obscure the well-established and growing body of evidence showing that both mothers and fathers provide unique and irreplaceable contributions to the raising of children. Children raised in traditional families by a mother and father are happier, healthier, and more successful than children raised in non-traditional environments.
David Cramer, whose review of twenty studies on homosexual parenting appeared in the Journal of Counseling and Development, found the following:
The generalizability of the studies is limited. Few studies employed control groups and most had small samples. Almost all parents were Anglo-American, middle class, and well educated. Measures for assessing gender roles in young children tend to focus on social behavior and generally are not accurate psychological instruments. Therefore it is impossible to make large scale generalizations . . . that would be applicable to all children.[1]
Since these words were penned in 1986, the number of studies on the subject of homosexual parenting has steadily grown. The fact that these studies continue to be flawed by the methodological errors warned about by Cramer has not inhibited the proponents of homosexual parenting from their sanguine assessment of the outcomes of children raised in homosexual households.
Silverstein and Auerbach, for example, see no essential difference between traditional mother-father families and homosexual-led families: "Other aspects of personal development and social relationships were also found to be within the normal range for children raised in lesbian and gay families." They suggest that "gay and lesbian parents can create a positive family context."[2]
This conclusion is echoed in the official statement on homosexual parenting by the American Psychological Association's Public Interest Directorate, authored by openly lesbian activist Charlotte J. Patterson of the University of Virginia:
In summary, there is no evidence that lesbians and gay men are unfit to be parents or that psychosocial development among children of gay men or lesbians is compromised in any respect. . . . Not a single study has found children of gay or lesbian parents to be disadvantaged in any significant respect relative to children of heterosexual parents.[3]
PROBLEMS WITH HOMOSEXUAL PARENTING RESEARCH
Upon closer examination, however, this conclusion is not as confident as it appears. In the next paragraph, Patterson qualifies her statement. Echoing Cramer's concern from a decade earlier, she writes: "It should be acknowledged that research on lesbian and gay parents and their children is still very new and relatively scarce. . . . Longitudinal studies that follow lesbian and gay families over time are badly needed."[4] The years have passed since Patterson's admission of the inadequacy of homosexual parenting studies, and we still await definitive, objective research substantiating her claims.
In addition, Patterson acknowledges that "research in this area has presented a variety of methodological challenges," and that "questions have been raised with regard to sampling issues, statistical power, and other technical matters (e.g., Belcastro, Gramlich, Nicholson, Price, and Wilson, 1993)." She adds, revealingly:
Research in this area has also been criticized for using poorly matched or no control groups in designs that call for such controls. . . . Other criticisms have been that most studies have involved relatively small samples [and] that there have been inadequacies in assessment procedures employed in some studies.[5]
Though she admits to serious methodological and design errors that would call into question the findings of any study, Patterson makes the astonishing claim that "even with all the questions and/or limitations that may characterize research in the area, none of the published research suggests conclusions different from those that will be summarized below." But any such conclusions are only as reliable as the evidence upon which they are based. If the alleged evidence is flawed, then the conclusions must likewise be considered suspect.
One suspects that the lack of studies with proper design and controls is due to the political agendas driving the acceptance of homosexual parenting, which favor inadequate and superficial research yielding the desired results.
In a study published in the Journal of Divorce and Remarriage, P. Belcastro et al. reviewed fourteen studies on homosexual parenting according to accepted scientific standards. Their "most impressive finding" was that "all of the studies lacked external validity. The conclusion that there are no significant differences in children raised by lesbian mothers versus heterosexual mothers is not supported by the published research data base."[6] Similarly, in their study of lesbian couples in Family Relations, L. Keopke et al. remark, "Conducting research in the gay community is fraught with methodological problems."[7]
A careful reading of studies used to lend support to homosexual parenting reveals more modest claims than are often attributed to them, as well as significant methodological limitations:
Nearly all of the existing studies of homosexual parenting have major deficiencies in sampling: They use a small sample size; they fail to obtain a truly representative sample due to sources of sampling bias; they do not use a random sample; or they use a sample with characteristics that are inappropriate for the crucial development research question involved in the study.[8]
Inadequate Sample Size. Studies examining the effects of homosexual parenting are weakened by inordinately small sample sizes:
• After finding no significant difference between a group of nine children raised by lesbians and a similar group of children raised by heterosexual parents, S. L. Huggins admitted, "The meaning and implications of this finding are unclear, and the small sample size makes any interpretation of these data difficult."[9]
• A report by J. M. Bailey et al. in Developmental Psychology, commenting on studies of the children of gay and lesbian parents, notes that "available studies [are] insufficiently large to generate much statistical power."[10]
• S. Golombok and F. Tasker admit in their follow-up study of children reared by lesbians, "It is possible that the small sample size resulted in an underestimate of the significance of group difference as a result of low statistical power (Type II error)."[11] Elsewhere they caution that negative effects of children reared by lesbians "could have remained undetected because of the relatively small sample size. Therefore, although discernible trends were identified, caution is required in interpreting these results."[12]
• In his study published in Child Psychiatry and Human Development comparing the children of homosexual and heterosexual mothers, G. A. Javaid frankly admits that "the numbers are too small in this study to draw any conclusions."[13]
• J. J. Bigner and R. B. Jacobson state in the Journal of Homosexuality:
Those who do study gay fathers may be frustrated by the difficulties of obtaining valid and adequate sample sizes. Most often, researchers must deal with many methodological problems in locating and testing gay fathers in numbers sufficiently large to make acceptable statistical analyses of data. For this reason, what is known currently about gay fathers is weakened by these methodological problems. It is practically impossible to obtain a representative sample of gay fathers, and those studies published to date frequently utilize groups of white, urban, well-educated males for study because of convenience sampling.[14]
• In her study of lesbian families, Patterson admits to sampling bias:
Some concerns relevant to sampling issues should also be acknowledged. Most of the families who took part in the Bay Area Families Study were headed by lesbian mothers who were White, well educated, relatively affluent, and living in the greater San Francisco Bay Area. For these reasons, no claims about representativeness of the present sample can be made.[15]
• Similarly, N. L. Wyers, in his study of male and female homosexual parents that appeared in Social Work, acknowledges that his study "cannot be considered representative" and that "therefore, the findings cannot be generalized beyond the sample itself."[16]
• By contrast