There actually are studies I have read that have shown that both a male and female parent are needed for your child's best potential emotional and mental growth. That is why children from single parents and gay couples actually DO have more emotional problems then those raised in a family of a straight man and a straight woman. I read those several years back actually, and I am not sure if there has been anything more recent on it. I will try to search for it for you.
(and yes, social stigma was suggested in the study as a possible explanation for the lower emotional stability of children raised by gay couples. It is more likely I think though that it is a mixture of both, as other studies have shown the importance of a male and female figure for a child to grow up understanding the emotions of both better.)
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