Since When did the concept of sex considered as immoral came to human thoughts?

I am not sure, if it is far too colourful to publish

A debate on yesteryear hot matters, hush hush
Will our ‘seen and heard it all’ mates, in the batch
Be shy to discuss, ‘by gone days, carnal practices’.

As scientists make us believe, the nature’s way of things
Survival and participation in progeny, vital for living beings
No animal is shy to show, its act of sex nor their genital prowess
Could our secretive attitudes to sex, be an evolutionary regress?

One school of thoughts put the blame on sexually acquired diseases
Being fearful in those backward era with no cure, ‘pre antibiotic times’ 

Disfiguring scars and ulcers were hideous, sexual acts deterring sights
Hiding with a leaf would have been the precursor, to us wearing clothes

In the pre Victorian era luxurious lives, were interesting to the rich aristocrats
Men hid bald patches with wigs and hourglass shaped corsets worn by dames

Gallons of gulped liquor, possibly made women frisky and men pretty useless
Willing servants, black or brown, happily obliged to fairer sex incessant demands

Society did not frown, if a coloured child was born to a Caucasian couple
No one knew the father as the substitutes changed, even in the same night
Aristocratic men, mostly were impotent, headless idiots, thanks to Rum
Sex starved drunken women allowed anyone, to fondle the nether region

Lack of sex drive, ‘prematurely ending the act‘ were demeaning words for men
There were no dildos, vibrators to satisfy the upper class highly sexed women
Self stimulation, bestiality, masturbation were then considered heinous crimes
Proof of man’s virility, a heir to family heirloom, were ladies expected burdens

There were madams running overpriced, high ranked prostitute dens

In twilight zones, alcohol and girls to comfort and forget man’s worries

Of course more they drank, bills went up sadly,  ‘business end went down’

Senseless and broke masters slaves carried home and everything forgotten

There was also a ‘great big elephant in the room’ deliberately unseen
Homosexuality was unseen, unspoken, dreaded demeaning condition
The wives and the in laws were embarrassed to become social outcasts
To admit men not attracted to feminine attributes and were avoiding fun

Genealogy had not reached even the stage of a ‘biology-piper’s dream’
An offspring with contrasting features & complexions was never a scam
Male servants to titillate ladies, pretty maids to help men were the norm
As aristocrats treated servants as objects of desire and used at their vim

Though stipends were mean they had accommodation, clothing and food free
No holidays, had to severe all links with their kith and kin, prisoners to a degree
Obedience, must and silence over matters to do with their lords and mistresses 

Just treated as slaves, bought to please aristocrats without descent or questions

Relationships were not always ticketty boo, unfortunately for the slaves

Occasional ladies with selfish orientated pride if ever felt their husbands

Attraction fell on a younger female slave with better physical attributes

Depicted in the film ‘twelve years of slavery’ choice be hell or high waters

Ariya