Yes ancient texts are a bugger aren't they? They don't come with big pictures and self help type bold print unfortunately.
Leviticus is a case in point where it is vital to understand the historical and cultural context. The Jewish people were trying to separate themselves from the Greco-Roman world as much as possible. Casual male to male relationships, and male to boy relationships, were celebrated in the Greco-Roman world. The complex set of rules create by the Judaic culture set them apart, it was about self preservation and protecting the lineage [fidelity, family, etc] You just cannot compare that with today's society where gay people live in life long, faithful relationships and have families. website puts it well
''In the Bible days, Greco-Roman society celebrated male-male sex. This was in great contrast to the Jewish culture of ancient Israel where any male-male sex appears to have been extremely closeted due to religious taboos. According to the Greeks, women were married to supply one with legitimate offspring, but all of a man?s real life occurred outside the home?away from his house-servant-wife who stayed at home and had no life.
Today, male-male relationships are said to be ?homosexual??a word coined in the late 19th century. Homosexuals by definition are ?persons sexually attracted to persons of the same sex.? Thus, we often speak of a person?s ?sexual orientation??gay, lesbian, bisexual or heterosexual. In contrast, pederasty is at base a debate over age of consent (i.e., youth-adult relationships). The point is that the morality of ?homosexuality? and ?pederasty? are separate questions, and the current debate over homosexuality has virtually nothing in common with the culture of youth-adult relationships known to the ancient Greek philosophers and their biblical critics.
Therefore, even if the Bible condemns the ?homosexuality? of the Greco-Roman society, we can only say for certain that it was condemning some or at most all forms of pederasty, not modern homosexuality. Why? Because we would be violating the historical context of these texts if we fail to wrestle with the truth that homosexuality in our historical context isn?t even remotely like that which occurred in the Greco-Roman world. Homosexuality today may be a sin in the eyes of some, but you won?t prove it by referring to texts that at most are merely condemning pederasty.