I feel that pretty much every religious text was wriiten to satisfy the needs of the society at THAT time. If, any religious book was written again in 2015, it would be totally different
This is your opinion but it's totally irrelevant to the debate. You may think that as a (non-religious?) person but so what? The vast majority of religious people believe their text to one degree of intensity or another is to satisfy the eternal needs of humanity. If it's created by God and God is perfect, surely so is the book.
This is typical of why these debates go nowhere. Non-religious people (who often know very little about religion) telling religious people how they ought to view their very own deeply held beliefs.
Sex outside of marriage is forbidden, and any sex within marriage should be for the sole purpose of procreation, according to the Bible.
This is a stereotypical catholic view, even then it's acknowledged sex can be for pleasure between a couple. Clearly someone missed all the erotic poetry in the songs of Solomon..
Spoiler
Songs of Solomon - 5
I slept but my heart was awake.
Listen! My beloved is knocking:
“Open to me, my sister, my darling,
my dove, my flawless one.
My head is drenched with dew,
my hair with the dampness of the night.”
I have taken off my robe—
must I put it on again?
I have washed my feet—
must I soil them again?
My beloved thrust his hand through the latch-opening;
my heart began to pound for him.
I arose to open for my beloved,
and my hands dripped with myrrh,
my fingers with flowing myrrh,
on the handles of the bolt.
Song of Songs 1
She
12
While the king was at his table,
my perfume spread its fragrance.
13
My beloved is to me a sachet of myrrh
resting between my breasts.
14
My beloved is to me a cluster of henna blossoms
from the vineyards of En Gedi.
He
15
How beautiful you are, my darling!
Oh, how beautiful!
Your eyes are doves.
She
16
How handsome you are, my beloved!
Oh, how charming!
And our bed is verdant.
He
17
The beams of our house are cedars;
our rafters are firs.
Incest couples (with the likelihood of deformed offspring) don't really fit the traditional view of marriage as a way to encourage procreation. However, with the changing of the concept of marriage to only focus on the love between two people, an incestuous couple could legitimately claim to be allowed to get married. I wouldn't be at all surprised to see this within the next decade, at most.
I don't see this happening. Change doesn't happen without action and there's no real history of an incest rights movement, community or brutal oppression.
As far as we know something like 1/10 people are LGBTQI+. 1 out of every 10 people is really enough to build a mass movement in political theory terms. I'd wager the number of people who are actively practicing an incestuous lifestyle would not even be 1/1000 or 10,000. I do not see people suddenly becoming more incestuous either, just like more people won't become gay as a result of the change in attitude towards gay marriage.