A long-term study of children raised by lesbians found that these children were less likely to suffer from physical and sexual abuse than were their peers who were raised by heterosexuals. This is thought to be due to the absence of adult heterosexual men in the households (Gartrell, Bos, & Goldberg, 2010). Girls raised by lesbians tend to have higher self-esteem, show more maturity and tolerance than their peers, and are older when they have their first heterosexual contact (Gartrell et al., 2005, 2010). Children raised by same-sex parents seem to be less constrained by traditional gender roles; boys are less aggressive, and girls are more inclined to consider nontraditional careers, such as doctor, lawyer, or engineer (Gartrell et al., 2005; Stacey & Biblarz, 2001). Over the course of more than 20 years, scientists studied the psychological adjustment of 78 teenagers who were raised by lesbian mothers. Compared to age-matched counterparts raised by heterosexual parents, these adolescents were rated higher in social, academic, and total competence, and lower in social problems, rule-breaking, aggression, and externalizing problem behavior (Gartrell & Bos, 2010). There are fewer studies of children raised by two men, but gay fathers are more likely than straight fathers to put their children before their career, to make big changes in their lives to accommodate a child, and to strengthen bonds with their extended families after becoming fathers (Bergman, Rubio, Green, & Padrone, 2010).
—  Martha Rosenthal, Human Sexuality: From Cells to Society, p.247.