Final answer:
Research comparing children raised by gay or lesbian parents and those raised by heterosexual parents has found that same-sex parents are as effective as opposite-sex parents, with some evidence indicating that children of lesbian couples may have slightly better outcomes in certain areas.
Step-by-step explanation:
Research comparing children raised by gay or lesbian parents and those raised by heterosexual parents has found that there is no quantifiable data to support the notion that opposite-sex parenting is better than same-sex parenting. In fact, children of lesbian couples have been shown to have slightly lower rates of behavioral problems and higher rates of self-esteem. This research suggests that same-sex parents are just as effective as opposite-sex parents.