Science Daily reports the American Psychological Association says there is no scientific basis of any difference between homosexual and heterosexual relationships and that scientifically they're the same. Scientifically speaking there is a difference, the APA is just ignoring it. Reproduction and the care of babies comes from heterosexual behavior (the link is geared to young teens with the use of cycle beads), not homosexual behavior even when we accept homosexual behavior as normal. Even if both are completely normal doesn't mean there are no differences, our public policy should be able to make such distinctions for the needs and care of children to have both their mother and father.
The APA is going against its own conclusions in the brief to the Supreme Court.
Other research on the role of fathers suggests that the influence of father love on children's development is as great as the influence of a mother's love. Fatherly love helps children develop a sense of their place in the world, which helps their social, emotional and cognitive development and functioning. Moreover, children who receive more love from their fathers are less likely to struggle with behavioral or substance abuse problems.
Children deserve and have the right to be loved by their mother and father. Right?
Do Children Need Both a Mother and a Father? asked by Science Daily in 2010 in which the article concludes with a no.
Evolutionary processes allow parents to bond with our biological children. Science Daily cites another article, just from a few days ago supporting that fathers are indeed important. Fathers are supportive, and necessary for a child's well being. The father's role developed strongly in the hunter/gatherers stage in human beings.
There are several cites in these links, that mention a gay father or mother. Because one parent is gay, doesn't mean the child loses his/her right to the other biological parent and this is the legal/social problem with same-sex couples claiming they have children together. Read: How a gay man fought for his parental rights and won against a lesbian couple, in which I defend the man.