I found the following articles.
J Biosoc Sci. 2006 May;38(3):413-8. *
Children of homosexuals and transsexuals more apt to be homosexual.Cameron P.
Do the sexual inclinations of parents influence those of their children? Of 77 adult children of homosexual parents who volunteered for three different investigations, at least 23 (30%) were currently homosexual: twelve (55%) of 22 daughters and three (21%) of fourteen sons of lesbians; five (29%) of seventeen daughters and three (17%) of eighteen sons of gays; none of six sons with both a gay and a lesbian parent. At least 25 (32%) were currently heterosexual. Of the ten with transsexual parents, one of nine daughters was currently lesbian, one was currently heterosexual, and one was transsexual. The son’s sexual preference was not reported. These findings suggest that parents’ sexual inclinations influence their children’s.
J Dev Behav Pediatr. 2005 Jun;26(3):224-40.
Lesbian mothers, gay fathers, and their children: a review.Tasker F.
There is a variety of families headed by a lesbian or gay male parent or same-sex couple. Findings from research suggest that children with lesbian or gay parents are comparable with children with heterosexual parents on key psychosocial developmental outcomes. In many ways, children of lesbian or gay parents have similar experiences of family life compared with children in heterosexual families. Some special considerations apply to the context of lesbian and gay parenting: variation in family forms, children’s awareness of lesbian and gay relationships, heterosexism, and homophobia. These issues have important implications for managing clinical work with children of lesbian mothers or gay fathers.
Curr Opin Obstet Gynecol. 2005 Jun;17(3):309-12.
**Reproduction in same sex couples: quality of parenting and child development. **
Greenfeld DA
PURPOSE OF REVIEW: Same sex couples are steadily becoming more open about their relationships. One consequence of this growing openness is that more couples of the same sex are choosing to have children and infertility treatment centers are increasingly faced with requests for assistance in creating these families. The aim of this review is to address new trends in reproduction in same sex couples, to consider the quality of parenting in lesbian mother and gay father households, and to review the literature on the development of children raised by same sex couples. RECENT FINDINGS: The current literature on these families is limited by small sample sizes and a predominance of studies of lesbian mothers and their children, with few studies of gay fathers and their children. A recent study of adolescents living with same sex parents recruited from a large national sample supports the notion that adolescents raised by same sex couples are doing well psychologically and are not more likely to be homosexual. The authors concluded that it was the quality of parenting, not parental sexual orientation that accounted for developmental differences. SUMMARY: The literature supports the notion that children of lesbian mothers and gay fathers are not more likely to become homosexual and are not measurably different from children raised by heterosexual parents in terms of personality development, psychological development, and gender identity. Larger longitudinal studies of same sex parents, particularly gay men, are needed, including those who choose to become parents through the use of assisted reproduction.
It looks like some of these contradict each other. If you would like the full articles let me know.