Whose theories are those? Here's what
the APA says:
Results of social science research have failed to confirm any of these concerns about children of lesbian and gay parents (Patterson, 2000, 2004a; Perrin, 2002; Tasker, 1999). Research suggests that sexual identities (including gender identity, gender-role behavior, and sexual orientation) develop in much the same ways among children of lesbian mothers as they do among children of heterosexual parents (Patterson, 2004a). Studies of other aspects of personal development (including personality, self-concept, and conduct) similarly reveal few differences between children of lesbian mothers and children of heterosexual parents (Perrin, 2002; Stacey & Biblarz, 2001; Tasker, 1999). However, few data regarding these concerns are available for children of gay fathers (Patterson, 2004b). Evidence also suggests that children of lesbian and gay parents have normal social relationships with peers and adults (Patterson, 2000, 2004a; Perrin, 2002; Stacey & Biblarz, 2001; Tasker, 1999; Tasker & Golombok, 1997). The picture that emerges from research is one of general engagement in social life with peers, parents, family members, and friends. Fears about children of lesbian or gay parents being sexually abused by adults, ostracized by peers, or isolated in single-sex lesbian or gay communities have received no scientific support. Overall, results of research suggest that the development, adjustment, and well-being of children with lesbian and gay parents do not differ markedly from that of children with heterosexual parents.