50 Things You Didn’t Know About Sex, revealed in new tell-all ebook

What is the primary sexual fantasy? How many {couples} are in sexless marriages? And does intercourse for people last more than it did for T-Rex? The solutions might shock you. A brand new ebook by David Baker, science author and visiting lecturer on the University of Paris-Sorbonne, tells all.

1. Our most intimate and romantic expertise might have begun as a type of cannibalism

Why have intercourse when you possibly can simply proceed the 1.8 billion-year technique of cloning (the place organisms reproduce precise copies of themselves)? An absence of meals because the earth froze to -50C triggered the microbial blobs which then populated the planet to cannibalise one another. In such easy organisms, this will likely have resulted in an unintended combination of DNA of predator and sufferer — creating the primary cells with two mother and father, and conferring potential genetic benefits.

2. Men have at all times been determined to show their value

Early feminine reptiles invested extra vitality in producing eggs than males did in producing sperm; in consequence females had been, usually talking, extra picky in choosing a mate. So, males advanced strategies to impress – turning their pores and skin vibrant colors, performing a kind of courtly dance and even utilizing their entrance legs to affectionately stroke females’ faces.

3. T-Rex had a 36-inch penis — however they had been 330 ft (100m) tall. 

Sex lasted only one minute.

4. The ‘Orgasmic Epoch’ — when placental mammals started to orgasm — dawned 66 to 55 million years in the past. 

Orgasms had been nature’s method of incentivising mammals to breed, on the idea that this pleasurable consequence of intercourse would encourage them to do it many times.

5. Millions of years in the past when mammals had been in fixed concern of predators, the orgasm was a welcome probability for full reduction from concern. 

In males the orgasm resulted in bodily shuddering at lightning velocity whereas mind exercise slowed down and concern and nervousness evaporated. Females in the meantime skilled pulses that in-built depth and an much more thorough and full absence of concern and nervousness.

6. One early facet impact of the orgasm in mammals was a state of ‘collapse’ which additionally had a organic perform. 

Whether it lasted a couple of seconds or a couple of minutes the collapse was there to facilitate the passage of sperm and fertilisation of egg.

7. This is why the French name the second of orgasm la petite mort, or ‘the little demise’.

8. A clitoris has 8,000 to 9,000 nerve endings — two to a few instances as many as within the penis. 

All to assist the conception, because the extra nerve endings the larger the post-coital ‘collapse’.

9. The clitoris advanced from the inner reptilian penis – stored contained in the physique for causes of security. 

Ninety per cent of a lady’s clitoris resides internally.

10. A feminine hyena’s clitoris is so long as a male’s penis.

11. Masturbation is widespread throughout the animal world. 

Lions and tigers are recognized to take pleasure in it. Some species of monkeys pleasure themselves with their tails. Elephants are recognized to get one another off with their trunks.

12. Bonobo monkeys masturbate each couple of hours and provoke sexual contact with a companion each 90 minutes.

Females ceaselessly take pleasure in so-called tribadism (or ‘scissoring’) — rubbing their genitals towards these of different females.

13. Female bonobos are extremely invested of their sons and micromanage their intercourse lives. 

There is not any rape or infanticide inside bonobo communities however there’s incest and paedophilia.

14 Orangutan intercourse lasts a median of quarter-hour. 

Gorilla intercourse lasts just one minute, whereas chimps get it over with in seven seconds, lest they be interrupted by a rival.

15. Average chimp penis girth is 5cm, whereas common human girth is 11.7cm. 

The male human penis thickened over time, pushed by sexual choice to favour feminine sexual pleasure and facilitate pair-bonding. Chimpanzee penises (though comparable in size) are extraordinarily skinny by comparability.

16. It is probably going that trans or and non-binary folks existed among the many Palaeolithic forager populations.

17. Bisexuality has existed for half a billion years.

18. Promiscuity and infidelity had been frequent in human foraging bands. 

Today roughly 20 per cent of males and 15 per cent of girls cheat on their companions.

19. In right now’s on-line courting, ladies gravitate in direction of solely a small 15 per cent of males which are deemed to be most tasty. 

This 15 per cent are typically tall, good-looking, excessive incomes and photogenic, the so-called 6, 6 and 6 — 6ft, six-figure revenue, six-pack.

20. Ancient civilisations had been tolerant of homosexuality. 

Aztecs, Mayans and Incas all appear to have permitted homosexuality. The Babylonian historic authorized textual content, the Code of Hammurabi, even makes provisions for some ladies to marry different ladies, whereas in Mesopotamia homosexuality seems in artwork and male on male intercourse appears to have performed an element in non secular rituals. In Medieval Japan, Samurai had been allowed to take younger boys as lovers, however solely one by one.

21. Numerous Christian kings, Islamic sultans, and even a Ninth-century Caliph had been most likely homosexual.

Ancient Greek mores held that the penetrator ought to be extra masculine and/or larger standing than the lover. Gay intercourse was solely seemed on negatively if the higher-ranking, or older particular person was on the receiving finish.

22. In some instances homosexual lovers had been allowed to be equals.

The Sacred Band of Thebes had been a gaggle of troopers who had been inspired to take one another as homosexual lovers within the hope they’d then battle extra ferociously on the battlefield.

23. A person’s social standing was once primarily based on how pleasurable intercourse along with his spouse was. 

In Ancient Rome, pleasurable marital intercourse was a cornerstone of virility, thus affecting the husband’s standing. In India, pleasurable intercourse was seen as important to the bonding of man and spouse.

24. Red Light Districts was once a authorized requirement. 

In Nineteenth-century France, brothels had been required to place up a purple lantern at their entrances, signalling they had been a home of in poor health reputation.

25. From the mid-Fifteenth century, the printing press was first utilized in Europe for making copies of the Bible and non secular sermons however swiftly moved on to pumping pornography across the continent.

26. With the start of movement footage got here the arrival of porn movies. 

The first, a striptease, was made in France in 1895. The first ‘hardcore’ porn movies had been produced in Argentina in 1905.

27. Number one amongst sexual fantasies is dominance and submission and S&M (sadomasochism), eventualities which can contain bodily bondage, therefore the umbrella time period BDSM. 

More than two thirds of adults — 68 per cent — have fantasised about BDSM eventualities, in response to a 2017 Belgian examine. It additionally revealed that almost half of all adults declare to have engaged in BDSM intercourse practices not less than as soon as.

28. The proportion of individuals participating in BDSM on a weekly foundation (12.5 per cent) is roughly the identical share of the human inhabitants with brown hair.

Those who interact on a semi-regular foundation (26 per cent) is identical share of the inhabitants with Type A blood.

29. Foot fetishes are frequent, significantly amongst males. 

At its core is a mix of very best mate choice and sexual rejection. A person finds a lady who’s an especially fascinating mate. So enticing are her numerous attributes that he feels his personal sexual market worth makes him worthy solely of her ft. And by idolising her ft, the sexual attract of the remainder of her is intensified.

30. Sex earlier than marriage took off in World War II with mobilisation of girls into the workforce.

Almost half of Western middle-class ladies skilled premarital intercourse between 1940 and 1945, when there was a 29 per cent spike in unwed teen pregnancies — and an uptick within the variety of sexually transmitted ailments.

31. The common creativeness exaggerates the variety of younger folks within the Sixties and Seventies who had been ‘hippies’ or ‘swingers’. 

In truth they most likely solely made up 1.5 to three per cent of the inhabitants in comparison with the far more straitlaced majority. But their prevalence in all types of media ceaselessly reshaped public attitudes towards intercourse as a type of leisure and pleasure.

32. Four out of ten adults within the developed world are neither married nor cohabiting. 

The variety of single folks within the developed world doubled between 1960 and 1970.

33. In 2019, a median of 45 per cent of singles beneath the age of 40 reported that they had been not on the lookout for a dedicated relationship.

This was roughly equal for women and men.

34. An estimated 20 to 25 per cent of millennials (born 1981–1996) are projected to by no means get married, and that quantity is predicted to be even larger for Gen Z (born 1997–2012). 

The causes? The sharp decline of in-person socialisation amongst youthful folks, with a consequent decline of in-person flirtation. Internet courting tends to be extra selective and exclusionary than hooking up at a membership or bar. Not forgetting the rise of free porn, substituting for actual life sexual encounters.

35. Casual intercourse dropped by 14 per cent between 2007 and 2017 for millennials and Gen Z. 

And in the identical interval the variety of folks beneath 30 reporting no intercourse prior to now yr virtually doubled.

36. An alarming estimate of two in 5 males have begun utilizing Facebook and Instagram as a masturbatory support. 

Around one-third of well-known feminine movie star accounts and as much as 63 per cent of novice mannequin accounts are adopted by males prone to be utilizing them for masturbatory functions quite than for movie star gossip, make-up ideas and adverts for coconut water.

37. Erectile dysfunction is now skilled by roughly one in each 4 males beneath 40 (24.5 per cent).

This is a large improve from the yr 2000 when solely 2 to three per cent confronted comparable points, in response to the Reward Foundation. Excessive porn use is the trigger. Essentially, males have gotten so overstimulated by utilizing pornography that candy, romantic intercourse with a lady they’re fortunate sufficient to truly meet shouldn’t be sustaining their arousal.

38. The {couples} most certainly to get divorced are those that work in city service industries. 

The least seemingly? Those who reside within the countryside and work in farming. The distinction is a staggering 400 to 500 per cent.

39. If a lady is a stay-at-home mom, the divorce charge halves. 

If the person is a stay-at-home dad, it doubles.

40. Fifteen per cent of married {couples} beneath 40 are sexless, and 30 per cent have intercourse lower than as soon as a month. 

It’s not stunning intercourse, or an absence of it, is a key purpose for divorce within the trendy world.

41. You’re 45 per cent extra prone to get divorced should you meet in a bar or membership.

42. Dating apps are utilized by greater than twice as many males (70 per cent) as ladies (30 per cent).

Women nonetheless favor to satisfy males offline by way of work, buddies or on an evening out.

43. Two-thirds of males stated they’d by no means strategy a lady they do not know in public, in response to a 2022 survey. 

Fear of rejection, being branded a creep or harasser, and a dependence on on-line courting have mixed to create this majority.

44. Yet they do not have a lot luck on-line both — ladies swipe proper (for sure) simply 12.5 per cent of the time, in comparison with 65 per cent of the time for males.

45. Male sexlessness is at document ranges: multiple in 4 males beneath 30 (28 per cent) haven’t had intercourse prior to now yr, and 17 per cent of males beneath thirty are virgins.

46. When it involves intercourse exterior of a dedicated relationship, solely 10 per cent of girls orgasm, in contrast with 68 per cent of these with a monogamous companion.

47. Of these 68 per cent of girls who expertise orgasm with a monogamous companion, solely six in ten accomplish that each time they’ve intercourse, in response to a 2015 survey. 

Eighty per cent of girls can’t orgasm with out clitoral stimulation.

48. The common variety of sexual companions for girls beneath 30 has doubled prior to now thirty years.

49 Nearly half of 30 to 45-year-old ladies within the developed world are single. 

If present developments proceed, the proportion of people that by no means discover a long-term companion might improve to 50 per cent and even two-thirds of the inhabitants of the developed world by 2100.

50. Sex might finally change into pointless. 

Some consider we are going to sooner or later develop a way of cultivating intercourse cells (sperm or eggs) from different cells within the physique, permitting anybody to have kids with anybody — even with themselves. The cells of lifeless buddies and family might be used to provide kids. Theoretically you could possibly take somebody’s DNA and procreate with out their consent — for instance, seize some pores and skin cells out of your movie star crush after they’ve left a restaurant and make a child collectively.

Adapted from The Shortest History Of Sex by David Baker (Old Street £14.99). © David Baker 2024. To order a duplicate for £13.49 (supply legitimate to 02/03/24; UK P&P free on orders over £25) go to www.mailshop.co.uk/books or name 020 3176 2937.