I belive that much more interesting (in a meaning of debate) question would be should gay couples be allowed to adopt children (without doubting that gay couples can be wonderful parents, but having in mind that in many societies children CAN have problems because of that, and laws help very little if, let's say, 6-year old has to cope with twenty other 6-year olds teasing him/her because he/she has two dads or two moms). Because I think we have kinda mutual agreement when it comes to marriage
Btw, I am from Croatia, Here gay marriages are still not allowed, but law recognizes gay couples...I am now bit short of english terms
so I'll try to explane it - this means that gay couples have same rights as non-married couples living together. E.g. if one of them dies, other is his/her legal inheritor (hope that's a right word)