Too many boys, male children, of homo's dress up like homo's for me to believe they are not being psychologically harmed by allowing gay parents to adopt.
I have a 1/2 sister daughter to a Lesbian whom my father says thinks she's a lesbian too. Coincidence? I think children of gays, adopted of course, are more likely to be gay than children of heterosexuals.
I find it disturbing to see boys pretending to be girls and girls pretending to be boys before they have even reached puberty. We didn't used to have this problem.
There is a sound argument that children of same-sex couples may tend to suffer from gender dysphoria, which is clearly a psychological disorder. So, that is a legitimate argument, but I am not certain that anyone has proved it.
I am not sure there is a 'sound argument'- clearly there are people who make that argument.
But since none of proven it- it isn't a 'sound argument'.
(by the way- the children I know of raised by gay couples do not suffer from gender dysphoria- not one.....so that blanket statement pretty much....a fail)