Two words..
CABIN BOY.
That is history. Socrates, Aristotle, the Romans, Lord Nelson, Batman & Robin (the TV series).
Homosexual relationships have been around as long as history itself. It has always been "okay", as long as it didn't interfere with one's "obligations".
Generally speaking, it was an upper class phenomenon.
Knowing little jokes, nods and winks were exchanged, but it was generally not spoken of in public, or polite circles.
Poorer, "lower" classes simply could not afford to keep a lover, and such behaviour was not as well tolerated among the common people.
What the "discussion" is about, is Marriage.
Marriage is what you do to produce offspring, and while it is considered a religious institution, it is also a legal union, and throughout history has also been a political union.
Many, if not most marriages were until recently, arranged by families to consolidate power, privilege, and money.
They were administered and approved by the church because the church stood to profit by such unions, and held the power the marriage ceremony (and divorce) to insure that profit.
You may consider this cynical, but even in this day and age, it is a truism that "money marries money".
What HAS changed, is the idea that homosexual MARRIAGE is okay.
That has never been OK before. Such relationships have traditionally remained outside the sphere of marriage, and even though the relationship may not have been publicly recognized, typically inheritances were included in wills, etc., and such individuals were even accepted at the deathbed. ( Often without a great deal of grace, but accepted. )
There's another post here that discusses what I think of the idea of such unions as a "marriage".
I don't accept that definition.
But you can read that one for yourself.