==Collapse of civilizations==
Some ancient civilizations that recognized same-sex "marriage" collapsed, while some that refused to recognize it escaped that fate.<ref>[httphttps://ezinearticlesarchive.comis/?The-Slippery-Slope-Of-Same-Sex-Marriage&id=824855 Ad5Pv The Slippery Slope of Same Sex Marriage]</ref> However, [[Correlation is not causation]], and there is not even a large enough data set to get a correlation.
==Legal disadvantages for heterosexuals==