Sadly, the really-terribly-written article doesn't actually have anything useful to say about the question in the title.

The title also begs the question!

Is sex fun? Most people might say "Yes", but not quite 100% of the population.

It's a leading question, not begging the question. Begging the question would be "sex is fun because of X, and X always happens because sex is fun"

I'm going to quote Woody Allen. The context is too delicious to pass.

"But isn't sex messy?" "Yes, but only when done right."

This would be an interesting survey.

Here's a quite specific answer from Philip Larkin:

  Sexual intercourse began
  In nineteen sixty-three
  (which was rather late for me) -
  Between the end of the Chatterley ban
  And the Beatles' first LP.

(from https://allpoetry.com/Annus-Mirabilis)

It doesn't answer the fun part, though, because Larkin was known to have a tedious love life.

Somewhere somewhen I read something that said that the common housefly has an enthusiastic copulation lasting half an hour. If true, this seems to suggest that sex was fun long before vertebrates.

It became fun when I got married.

Your comment is going up and down. Maybe this is because of the word marriage.

Formulated differently, from my subjective, unique, non reproducible and totally unscientific experience of being 16 years together with my wife with three kids, the quality and fun is positively correlated to the level of reciprocity and trust in the relationship.

And for the young readers, reciprocity and trust can really increase over the years, which increases the fun, which naturally increases reciprocity, which ...

I know you're getting dv'ed but I actually like this comment. It may have something to do with the true answer to the question. Perhaps developing social structures were somehow important or perhaps sex-as-fun was important to developing social structures.

Thanks, and by the way this is honestly how it has worked for me.

Just wanted to chime in I like this comment too.

Having a dedicated partner with whom you can explore your wildest fantasies is a very fun thing. :)

What is this article about? I see sentences, but they don't seem to make a point.

We don't need predictable insults against the community (which includes you) like this on HN.

Since we discovered the orgasm!

That doesn't really answer the question, when did "the orgasm" arise?

When sex started to be fun!

Oh. So, the 1960s, then.

There's a lot of references to orgasm in the writings of Shakespeare's contemporaries. Ancient Egyptians had a very playful attitude towards sex, as evidenced by art and writing. Romans had recreational sex, aided by the availability of a natural abortion inducing drug. Also, quite famously, there is graffiti from ancient Rome admonishing a local resident to stop constantly going down on local women.

Recreational sex is a basic human thing, across cultures and across history. People who think otherwise are just demonstrating ignorance of history and culture. This is common among young people, who often aggrandize themselves by convincing themselves that they are the first people ever to discover [insert basic human thing here]. Much harm has come out of their activities. (Though this too is a basic human thing, and much fun has also come of it.)

Well, the Kama Sutra is said to origin from around 400 BCE.

BCE has always weirded me out a little. Making it secular by just changing the suffix isn't really doing anything imho. I just read the Wikipedia entry and noticed that "vulgaris aerae" or "Vulger Era" for AD was once common. Now that is an equally problematic fix, but one I like.

BCE has the advantage of pleasing everyone.

Before Christ Era

Before Common Era

Before Current Era

Probably around the same time people realized it felt good