Sex sells --- you've heard it a thousand times, because it's so true. There's no better example than 50 Shades of Grey author E.L. James, who's now worth an estimated $80 million thanks to the success of the books and the movie franchise.

At the intersection of love, sex and money, you find a lot of odd and alluring facts. We've pulled together dozens of them, in a collection we call "50 Shades of Green."

Grab a glass of wine, light a few candles and read on.

50. As seen at the movies

BUCHAREST, ROMANIA - MARCH 12, 2015: Fifty Shades of Grey Bestseller Books For Sale On Library Shelf
Radu Bercan / Shutterstock

The Fifty Shades films tend to heat up the market for certain, uh, equipment seen in the movies. For example, the release of Fifty Shades Darker in 2017 led to a doubling in sales of some bondage gear.

49. Victoria's $2M secret

Models walk in the Victoria's Secret Fashion Show in Paris, France on November 30, 2016
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Every year the Victoria's Secret Fashion Show features a Fantasy Bra — with a fantastic price. The 2017 model was valued at almost $2 million and was weighed down by over 600 carats in diamonds, yellow sapphires and blue topaz.

48. Spreading the love

Top view of happy young couple looking at each other and smiling while lying on wooden floor. Girl is holding a red paper heart
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More than half of Americans typically plan to buy gifts for Valentines Day. The National Retail Federation says the most popular choices year after year are candy and flowers.

47. The cost of swiping right

ROSARIO, ARGENTINA - JANUARY 19, 2017: Man with a white cell phone in his hands. On the screen you can see the Tinder application with a girl profile open. Application.
Alex Ruhl / Shutterstock

On a first date, Americans tend to spend more than $40 — if the two of them met through work or friends. But if they met online, they spend less than $20, a survey from coupons website RetailMeNot found.

46. Whee-oming

Castle Geyser erupts with hot water and steam with pools of thermophilic bacteria and it's a cone geyser in the Upper Geyser Basin of Yellowstone National Park, Wyoming, United States.
Benny Marty / Shutterstock

According to adult products retailer Adam & Eve, Wyoming is the state with the most sex toy purchases per capita. Maybe it's the cold winters and the isolation in this sparsely populated state?

45. Happy in toyland

Two red hearts and steel handcuffs on dark background.St Valentine day and Fifty shade of black concept
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The adult toy industry is massive, generating annual revenue of $15.4 billion. To put that in perspective: It's more than the NFL makes.

44. Latex outlays

Close up shot of various colored condoms
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Couples who use condoms for birth control spend around $150 a year on them, according to the American Pregnancy Association.

43. Sexing up the tax base

Silhouette of palm trees at sunset, vintage filter
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Pornography is a huge business in California. It pays close to $36 million in state and federal taxes each year, and the industry has its own lobbyist.

42. Stats that will bring on your O face

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Every single second, 28,258 people around the world are viewing online porn. It's through this kind of engagement that the industry makes $3,075.64 per second via ad revenue.

41. Sorry, guys

Picture showing young couple with flowers dating in the city
Kamil Macniak / Shutterstock

Men spend twice as much on Valentine's Day as women, according to National Retail Federation surveys. In 2017, men were planning to spend $190.53 on average, versus $96.58 for women.

40. When porn was born

Heap of old 35 mm movie reels with out of focus clapper and boxes in background, vintage black and white
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Unsurprisingly, the first X-rated movie was produced almost as soon as the motion picture was invented. The silent French film was shot in 1896, and only a short clip has survived.

39. Taking it off, raking it in

Woman Silhouette Dancing at the Hotel
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Legendary striptease artist Gypsy Rose Lee — whose life story is told in the musical "Gypsy" — sold out the London Palladium at the height of her fame and was paid the equivalent of nearly $36,000 a week in today's dollars.

38. Porn in the USA

Online concept
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Various estimates say America's pornography industry racks up anywhere from $4.3 billion to $20 billion in sales each year. An estimated 60% of the world's adult content websites are hosted in the U.S.

37. Maybe if 'Big Bang Theory' went X-rated...

Big LCD panel with television stream images and remote control in hand
Piotr Adamowicz / Shutterstock

The U.S. porn business makes more revenue than CBS, NBC and ABC combined. Makes you wonder how successful the networks would be if they decided to make Saturdays smut night.

36. Love buys happiness

A midsection of a romantic couple sitting on a bench in the park holding Valentines gift and flowers
Kamil Macniak / Shutterstock

Giving your significant other a gift is good for you! According to a number of studies, spending money on your loved ones will make you happier than spending on yourself.

35. We're No. 1!

Flag of the USA with sunflare
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The U.S. is the world's largest market for adult toys, accounting for not only the most sales but also the most Google searches for the term "sex toys." Atlanta is the city that leads the nation in those searches.

34. The porn pay gap

Concept of gender pay
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How's this for a gender gap? Men who appear in adult films are paid an average of $250 per shoot, while women can receive between $500 and $1000 per shoot.

33. The price of the pill

Contraceptive Pill
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Birth control pills cost up to $600 a year. "The pill" requires a prescription from a doctor and must be taken daily.

32. It pays to be patient

Two  colleages discussing ideas using a tablet and computer
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A 2013 study found that a woman who waits until after her 30th birthday to get married earns roughly $18,000 more per year than her peers who married earlier.

31. Men likely to go bust

guy looking at a nice girl passing by...while walking at the street
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According to Psychology Today, men who prefer buxom women are more financially insecure. In other words, a guy looking for a busty partner ought to be paying more attention to his bank account.

30. The wide world of porn

adult abstract blur background with bokeh effect
nikitabuida / Shutterstock

By one estimate, the global pornography industry is a $97 billion business. The U.S. consumes the most online smut, followed by Iceland, the U.K., Canada and New Zealand, according to the website PornHub.

29. A financial Hub

Online concept
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PornHub has become one of the most popular websites in the world. It gets 1.68 million visits per day and over 14 billion hits per year.

28. Cash or charge?

Mobile Credit Card Reader on white background,  payment is easy for customers
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A 2016 survey found that 10% of pimps were accepting credit or debit cards. And that can only increase, given the growing use of Square and other technologies.

27. Booming brothels

Welcome to fabulous Las vegas Nevada sign with blur strip road background
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Twenty-one brothels operate legally in Nevada, the only state that allows them. Nevada has no state income tax, but the brothels and prostitutes do pay federal income tax, as well as county taxes and local fees.

26. Gold-digging is out

Family Memorial Day Lover sweetheart Couples love sea Beach
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Who marries for money? Apparently not many, judging from a Pew Research survey. In it, 88% of Americans cited love as the top reason to marry, followed by the need to make a lifelong commitment (81%), companionship (76%) and having children (49%).

25. Skip the gym and get busy

Close up of male and female feet. Loving couple is lying on bed under blanket covered by small red paper hearts
Olena Yakobchuk / Shutterstock

Here's another reason not to pay for a fancy gym: An average 30-minute sex session can burn as much as 200 calories! So skip the gym membership and burn off that late-night pizza doing the horizontal tango.

24. No money, no marriage

Two wedding rings and money
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The U.S. marriage rate is the lowest in decades. Half of Americans 18 or older were married in 2015, versus 72% in 1960, Pew Research says. The most common reason for not getting hitched? Not feeling financially ready.

23. 1 in every 8 websites is... (Guess!)

Search filed on a computer screen. Macro image.
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It is estimated that up to 12% of websites searchable on Google are adult sites. That would mean that there are more than 26 million of those sites, making porn the most popular category on the internet.

22. Use bitcoin at the brothel?

Stack of bitcoins with gold background with a single coin facing the camera in sharp focus with shading on the icon letter B on the face of the bit coin
Steve Heap / Shutterstock

Las Vegas legal brothel The Bunny Ranch is considering whether to accept bitcoin from clients. "Bitcoin is a natural fit for people who have much to lose if their private matters were to ever fall into the wrong hands," owner Dennis Hof says.

21. Tinder makes wildfire

CHIANGMAI,THAILAND - NOV 02,2016 : A hand holding Apple iPhone 6 plus with Tinder application. Tinder is a location-based dating and social discovery service application
Mr.Whiskey / Shutterstock

Tinder, the ubiquitous online dating app, is now up to 50 million active users. The app is free, but those who are seriously looking for love can access a premium account for $9.99 a month.

20. Remarriage is the new marriage

Middle-aged couple ~
Lincoln Rogers / Shutterstock

In 1960, 13% of married people had been married before, to someone else. Today, the percentage who are remarried is up to 23%. Apparently, more people are willing to try again.

19. I do...not want to pay that price

a slice of a wedding cake on dish.
wandee007 / Shutterstock

The people at the Guinness Book of World Records say the highest price ever paid for a slice of wedding cake was $29,900. A San Francisco couple paid that in 1998 for a piece of cake from the Duke and Duchess of Windsor's 1937 wedding.

18. Your credit score may help you score

Close up portrait of a happy young black woman smiling
mimagephotography / Shutterstock

According to recent research, 58% of Americans say a potential partner with a high credit score is more attractive than a date who drives a nice car. Furthermore, 40% of respondents preferred a good credit score over physical attractiveness.

17. Serious bling

L'Incomparable Diamond Necklace
MOUAWAD

Want to really go all out to show your love for that special woman? The world's most valuable necklace is worth $55 million and contains the largest flawless diamond in the world, plus 102 other diamonds, according to Guinness.

16. You can get paid for dates

screen grab of WhatsYourPrice.com
WhatsYourPrice.com

If you look hot, websites such as WhatsYourPrice.com allow people to enter a bidding war to date you. These sites have been popular in Asia for some time. Nothing like a little money to spark up interesting dinner conversation.

15. A business with a lotta heart

Candy Valentine's Hearts
Andrew Williams / Shutterstock

Every year, 8 billion candy hearts are produced for Valentines Day. If you placed them all in a line, they could stretch from Italy to Arizona almost 20 times!

14. DirecTV gets turned on

HDR image, DirecTv installation satellite dish antenna, company service truck - Revere, Massachusetts USA - September 29, 2015
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Some cable companies have removed adult content from their pay-per-view options, but not satellite provider DirecTV. It has embraced adult programming and makes up to $500 million a year from it.

13. Love that don't come cheap

Hand of a man looking at vinyl 7
Gary Perkin / Shutterstock

In 2009, an anonymous collector paid $39,294 for a rare 7-inch record of an unreleased song from 1965 called "Do I Love You (Indeed I Do)" by Frank Wilson. Guinness says it's the most expensive music single ever sold at auction.

12. Many of us like to watch

young funny girl peeking over top of laptop
fizkes / Shutterstock

An estimated 40 million U.S. adults view online pornography at least once a month. That's more than 16% of the adult population. About one-third of regular porn users are women.

11. How I met your mother

talking to each other at a park on a summer day
eurobanks / Shutterstock

Couples who married in 2017 were asked how they got together, and the most common response was: online (19%). That was followed by "through friends" (17%) and "at college" (15%), says The Knot.

10. Let's give unmentionables a mention

beautiful sexy bras on a wooden background
Christina_summer / Shutterstock

More than $11 billion in intimate apparel is sold in the U.S. each year, according to the most recent market research from NPD Group. The total includes $6.4 billion in bras and $3.7 billion in panties.

9. Spammy and smutty

Computer Monitor screen, concept of spam email
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If you've looked in your junk folder lately, it probably won't surprise you that an estimated 8% of emails have pornographic content. That means that over 2.5 billion emails are sent containing porn every day.

8. Big day, big price tag

Wedding. Banquet. The chairs and table for guests, decorated with candles.
Alex Gukalov / Shutterstock

Taking into account everything from backyard nuptials to super-elaborate destination ceremonies, the average cost of a wedding is now more than $35,000. So says The Knot, which points out that its tally doesn't even include the honeymoon!

7. The marriage equality economy

Cute newlywed gay couple laughing together
CREATISTA / Shutterstock

Same-sex marriage, which the U.S. Supreme Court legalized in June 2015, contributes close to $1.6 billion to the economy each year. Researchers at the Williams Institute say that's enough spending to support about 19,000 jobs.

6. The 'special' undies

Woman choosing bra. Romantic lingerie. Drawers filled with sexy lace lingerie. Textile, Underwear.
AbElena / Shutterstock

Maybe this is Victoria's real secret: An overwhelming 84% of women say they have "sex lingerie" that they take out of the drawer on those special nights, the British lingerie company Bluebella found.

5. Sweets for the sweet

Chocolate with ribbon and heart on St. Valentine's day love.
Jaroslaw Pawlak / Shutterstock

Americans who celebrate Valentine's Day will spend $1.8 billion to give candy for the holiday this year, the National Retail Federation says. And never mind the calories: Candy is the gift of choice for 55% of V-Day shoppers, up from 50% last year.

4. Pets get some love, too

Belgian shepherd dog with heart pillow
tinyowl7 / Shutterstock

A National Retail Federation survey says we'll spend an average $5.50 on our pets for Valentine's Day. They'll make out better than our co-workers — we'll plop down an average of just $4.79 on them.

3. Bloomin' billions

Roses and a hearts on wooden board, Valentines Day background, wedding day
Valentina_G / Shutterstock

Forecasters say Americans will buy $2 billion worth of Valentine's Day flowers in 2018, often red roses. V-Day is the second biggest day of the year for florists, after Mother's Day.

2. Sexy Warren Buffett?

Laguna Niguel, CA, USA
Krista Kennell / Shutterstock

Folksy billionaire Warren Buffett has a thing about using sex analogies. He has said that not spending money is like saving sex for your old age, and that an Obama economic measure was weak — like a half tablet of Viagra mixed with candy.

1. The climax of this report

Woman Body Legs Bed Awaking Morning Step Female Foot Sleep Relax Concept
Golubovy / Shutterstock

Possibly the world's most expensive sex toy is sold by an upscale online erotica shop called Fornicari. "The Pearl Royale" is a vibrator that sells for $1.42 millon, is made of solid platinum and has diamonds, sapphires and South Sea pearls.