There is no reason why: children adopted by same-sex parents are just as emotionally and psychologically healthy as any child raised by heterosexual parents.
Several studies have shown that children who have grown up in a gay family environment are more open and have fewer prejudices within society regarding the segmentation of sexual roles. Having and raising a child is a process that is based on love and the desire to care for the child first.
Read the full article on: LGBT Adoption: Are Gays Allowed to Adopt in United States? ( 33).