As I said before, sexual "orientation" did not exist in the Greco-Roman or even Biblical for that matter worldview. It's a concept dating from the 19th century.I think the introduction's caution about using the term "homosexuality" is interesting from a modern perspective. To a modern gay man, being gay is as much about who you fall in love with (and emotionally bond to) as it is about the sex. (Okay, at least for this INFP.)
Interesting theory, but it would fall flat on some grounds. The emphasis on intimacy within marriage goes back quite a few years, even if one simply looks at the Christian tradition for example. In fact it's often argued that Christianity actually helped free marriage more from political-economic concerns, and placed it more on the intimate bond of two sould before God.Of course, the modern conception of marriage is also quite different in its emphasis on emotional closeness and compatibility. It makes me wonder if the idea of "homosexuality" partially falls from culturally seeking to align marriage with sexual attraction and emotional intimacy, as opposed to being about political and economic ties between families.
No the origins of "gay marriage" lay more within the mentality that prevailed in wake of the Sexual Revolution.