... and who did them?

There's no way that any study would be reliable at this juncture because queers are just now coming out of the closet and seeking same-sex marriage and the quest to have kids, and ultra-liberal states are just now letting them have custody of kids.

Plus, most of those type "studies" are self-seeking in that they are conducted by queers with an agenda.

As usual, what you accept as "research" and what I accept as "research' are miles apart ... I am far mor conservative and discerning than you.