In many ways, it is the very opposite: the "egalitarian" model of homosexual relationships was itself a new development and a desirable outcome of the gradual "

In many ways, it is the very opposite: the "egalitarian" model of homosexual relationships was itself a new development and a desirable outcome of the gradual "cultural acceptance" of homosexuality. You can see this even with very recent developments such as same-sex marriage. The polar opposite to that is the ancient, Graeco-Roman model of homosexuality (but also found today in many parts of the non-Western world, and even reflected e.g. in stereotypes about sex in prisons) as simply an exertion of male-on-male dominance and power. (Though, to be fair about it, ancient "fornication" wasn't different either! This is the underlying rationale for why a number of ethical traditions in the Classical world, including Christianity, condemned both sexual practices in very similar terms - both were incredibly far from anything that could be considered "egalitarian" or, in even more modern terms, respectful of "consent"!)