@Ken cv,
Psychological studies have been done comparing the children of straight parents and children of gay parents. Initially results seemed to conclude that children reared by straight parents were similar in all ways to children of gays.
Now, they have realized the likelihood of a child reared by gays to be gay themselves is much higher, and that they will not perform as well in school and have as much business or monetary success in life. The statistics on that was very close though, so I don't know how much stock I put into the success in life part. I'll have to find my source, I should be back in this thread soon with it.