Some of the comments on that article are right though, this "science" is bullshit. If anything they should try prove that homosexual partners have bad influence or something on the children they raise if such claim exists. And not the opposite way, there wasn't any proof for the opposite arguments, so why would they even bother investigating this? Just to raise "public awareness"? But they assume that most people think it is harmful to the children or what? That part really is wtf.
As for marriage itself, I guess it depends what they want but marriage doesn't equal having children like someone said. And marrying in churches for example, why would they bother anyway? The church itself is against it, so why should they go to people that despise them and have them married anyway? Unless it feels good for the pair to be "on top" of things suddenly and to show them, "you repressed me, now we strike back" or something like that.
I myself wouldn't want to be married though with same sex partner. They can do just fine with registered partnership for the most part, the marriage only brings more legal BS to the entire affair and you'll get depts from the partner and stuff like that. Not to mention divorce and stuff. So why bother anyway?