The debate on same-sex marriage seems a result of the only fact that society is like an old space station which somebody neither wants to return to the Earth nor can renovate it because a new one is much more effective. However, we cannot create new society because there are always people who benefit from the current society and people who have been victimized by norms, laws and other people. Regarding the same-sex marriage, the ones who make decisions at level of law may have no on-site experience with the problem while the books on same-sex marriage do not have global impact at level of general change of human thinking.
From anthropological perspectives, there is no problem with same-sex marriage since anthropologists make difference between sex and gender. The sex is the biological attribution of the individual while the gender is the personal identity and self-awareness. Gender is also the connectivity between brains. Since love as an emotion and the tree of marriage relates to the brain, to debate why two same-sex partners want to marry look even a deviation from the normal social thinking in light of current neurobiological knowledge of what is human and how humans connect to each other.
The other side of the anthropological coin however, is the normative culture of a successful social reproduction. Same-sex marriage ignores the opportunity the children to be raised by their both biological parents. Also, the interaction between man and woman seems more beneficial since two different types of brain interact while in same-marriage usually one of the brains has been developing to think as male, but biologically it is a female brain. Then, normative culture would prefer man and woman although in contemporary society there are missing the roots of the stable traditional family – women work, no time for children at home, big classes at school with programs which rarely discuss culture and especially family and human relationships, blooming gay-and-lesbian culture which is often with aggressive goals, etc.
The strong part of same-sex marriage request is the fact that people understand the importance of family in the social and cultural reproduction. Strong same-sex family of married partners very likely will raise children with future heterosexual attitude while absence of marriage creates a culture of dysfunctional couples since marriage is a clue without substitution in the social practices – the clue which is the strongest and most successful means of healthy social reproduction.
Call for marriage is itself a call for keeping human in humans. Marriage creates family and if we still believe that family is the healthiest elementary social cell of a successful social reproduction, we need to accept that marriage does not depend on sex but on the way two people connect to each other for the future happy life and positive contribution to society as their members.