When did sex outside of marriage become socially acceptable?

I mean in the UK other Western countries.

According to my mum it was the norm during her day (the 70s-80s), although attitudes were still more conservative then than they are now. I used to think that the 1960s Free Love movement and the 1970s Sexual Revolution were what changed attitudes, but some of the literature from the decades that predated those indicate that attitudes were already shifting when compared to Victorian and older literature.

Since when does religion and other past traditions decide what people of today do?

I didn't say it did, I was just curious

Having studied british social histories.... sex was incredibly common and acceptable outside of marriage in a variety of different periods. For example in serious relationships handfasting often a precursor to marriage which often resulted in people having sex. Also sex with mistresses or 'kept men' was generally recognised and acceptable in earlier periods and the use of female and male prostitutes was often seen as a way for people to release their sexual urges. However all this changed era to era or between different religious leaders.... so meh.... you won't get any consistent answer.

In relation to the modern era, it probably occurred roughly the same time non-barrier contraception became fairly commonplace as you no longer had the same risk of having children out of wedlock (thus confirming in theory who the child's father was.... not flawed in the slightest eh?), which was the main reason people waited until marriage to have sex.

Yet implied. :/

it hasnt....

How?

I mean in the UK other Western countries.

According to my mum it was the norm during her day (the 70s-80s), although attitudes were still more conservative then than they are now. I used to think that the 1960s Free Love movement and the 1970s Sexual Revolution were what changed attitudes, but some of the literature from the decades that predated those indicate that attitudes were already shifting when compared to Victorian and older literature.

Because some religions forbid sex before marriage. Way back then it was never socially acceptable to do dis kinda stuff.

What makes you say that?

Of course, but at some point in time the religious teachings surrounding this (and all of the other factors which made it taboo) no longer mattered nearly as much in the West. I was curious as to the exact time period when this gradual change began. That does not mean that religion dictates what the people of today an and can't do, nor that it should.

I mean in the UK other Western countries.

According to my mum it was the norm during her day (the 70s-80s), although attitudes were still more conservative then than they are now. I used to think that the 1960s Free Love movement and the 1970s Sexual Revolution were what changed attitudes, but some of the literature from the decades that predated those indicate that attitudes were already shifting when compared to Victorian and older literature.

I have been reading about the English Civil War and the period around it (1600s), and despite the nation being entirely religious, though not necessarily to the same one, promiscuity did happen and even kings, specially Charles II, engaged in it quite heavily, while rumours, ones with evidence, that James I engaged in homosexual relations with two of his courtiers. When Oliver Cromwell came to power, and after he lost a battle to the Spanish, a great one, he enforced piety by making some acts, like promiscuity, illegal and punishable, if I am not mistaken, by death. After him, however, with the rule of Charles II, the nation returned to a somewhat lax measures with regards to sex. His court was known for its extreme carnal activity and promiscuity. Also, it was reported by people like Pepys that with the rise of the Royal Society and science by the end of the 17th century, people were becoming less religious anyway (the general public) and were more concerned with matters of science than with religion.

(By sex outside of marriage do you mean even for unmarried couples or just married ones? In anyway, it was always, in a way or another, normal for rich people, like kings and lords, to marry specific women for gain of power, titles or relations while at the same time being consumed in extramarital relationships).