Or maybe the facts about the amount of sexually transmitted diseases spread within each category of "marriage".
For example, gays were almost totally responsible for the spread of AIDS.
What doesn't make sense about the concept of queer marriage, is the very common practice today between those who don't have that neurological defect, who just agree to live together.
Keeping in mind, that the queer category can't procreate anyway.
"Partners" is now a very common practice for cohabitation.
In that case, most legal responsibilities do apply, as in a normal marriage.
But I guess, those who agree to that, have nothing to prove.