Trying to unearth which was the ancient perspective on homosexuality starts from a false premise, I believe. While the existence of homosexual acts is documented by the very specific verses of the Old Testament, homosexuality per se is only a recent construction. Sex between men was probably a constant but infrequent occurrence during the biblical times, and it was only the gradual intolerance towards it, culminating with its formal prohibition that has led to the development of homosexuality as a lifestyle. It is to be noted that even with the ancient Greeks, homosexual sex was condoned, but homosexual love was considered a form of weakness and depravation. Homosexual activity as a rite of passage towards manhood was a fairly normal occurrence; however, when this practice started to be seen as socially inadequate, and even reprimanded, it went from being a normal activity to something that men were forced to hide as a secret treasure. What once was only a power game between men, and a way of releasing masculine energy slowly became an issue of love and commitment, and a form of seeking a forbidden pleasure.
All the natural impulses to which civilization imposed a dam could not simply disappear but have found a different course of accomplishment and a whole new specter of justification. Therefore, it is futile to search for biblical or historical arguments supporting tolerance towards homosexuality, when homosexuality itself is a result of intolerance. If Jesus was Himself accepting or not towards homosexual activity is, again, a misleading pursuit, because Jesus neither recommended nor denied any specific course of action, which is obvious in the way he looked upon the old laws as something outdated in their letter and in dare need to be fulfilled in spirit. Trying to make Jesus say or not say something explicit was the very thing Jesus seems to have avoided. If anything is true about Jesus' mission, He tried to get the means of existence unstuck from the very ends humans ascribed to them. The only acceptable end of every means is, in Jesus' eyes, only God (which is to say, an open end, or the means itself). Therefore, there is no human endeavor that can be stopped solely on human grounds; moreover, God's intentions can never be taken at face value. If there will ever come a time when homosexuality will be accepted by the Christian faith, this will not come by reinterpreting the scriptures but by understanding their spirit beyond any recourse to literal interpretation.