Did you know?

Bizarre methods for increasing penis size Different cultures have used a variety of methods for increasing a man's penis size: Attaching weights (Indian holy men and Sadhus); Poisonous snake bites, which hurt like hell but caused enlargement (Brazil's Topinama tribe); Puncturing the testicles and attaching stimulators (Dayak men in Borneo); Hanging weights on the penis (African tribes up to 2000yrs ago); Trimming the pubic hair and losing weight to give an impression of increased length; Using beading of the genitals, including implanting ball bearings, rings and studs (Indonesia and south Asia); Placing a bee-filled bamboo over the penis (Amazon wedding ritual). The Miscellany of Sex - Franscesca Twinn

Legendary imagination of Japanese sex clubs
		When it comes to sex clubs, the imagination of the Japanese is boundless. They range from clubs full of fake nurses, air hostesses and secretaries, to clubs offering rotating sushi-style breast fondling, special 'Marilyn' features of watching while she stands over a hot air vent, naked karaoke, soapgirls, 'handpicked brides' who bathe their customers, and anime clubs (sex with manga characters). In 'police investigation' clubs, guests fight over who gets to wear the police cuffs, while in fake train carriages up to 14 customers can grope underdressed women in hot rush-hour conditions. The Miscellany of Sex - Francesca Twinn

Kama Sutra lessons for him
The Kama Sutra teaches a man how to prolong his pleasure so that he can ensure his partner is pleasured first. This is in direct contrast to the average man's experience of masturbation. As youngsters, most guys learn to bring themselves to a quick climax (typically, in a matter of seconds) to avoid getting caught. But this doesn't do women any favours, as men generally reach orgasm far quicker than women tend to. The Kama Sutra teaches men a number of techniques to help delay their orgasm, such as controlling his breathing and using a lighter touch. Ann Summers little book of kama sutra - Siobhan Kelly		Photo: Jacob Appelbaum/Creative Commons

Post-sex gender differences
		Why do women and men react so differently after sex? It’s all about chemicals. Women’s bodies flood with oxytocin, which makes them want to cuddle. Men become drained of glycogen, a vital source of energy. Thus women want to bond, while men prefer to sleep.
Oxytocin is also produced during breast-feeding and may be involved in the bond that forms between mother and child. Recent research found that the more sex a woman has with her partner, the more oxytocin is produced, deepening her bond. supersex - Tracey Cox; the sex inspectors masterclass – Tracey Cox and Michael Alvear

Can you get pregnant from anal sex? It is not uncommon for heterosexual couples to practise anal sex to avoid pregnancy, but it's a myth that you can't fall pregnant this way. According to statistics, about 8% of couples who use anal sex as a birth control method actually conceive. Known as 'splash conception', the semen seeps from the anus and into the vagina. The Big Bang: nerve’s guide to the new sexual universe – writers at nerve

Self-fellatio
Roughly two in every 1000 men are supple enough to perform fellatio on themselves.
supersex – Tracey Cox

Learning to ejaculate and source of orgasms
When does the average male first ejaculate? The youngest age is eight and the oldest age is 21, according to the watershed Kinsey report based on studies conducted in the US in 1948 and 1953. In almost 70% of cases, masturbation was the source of stimulation to orgasm, while 13% climaxed through nocturnal emission, 12% through intercourse and just over 4% through homosexual activity. The remainder ejaculated through a variety of sources, including ‘premarital petting’.
The Kinsey Institute – data from Alfred Kinsey’s studies

Ready, steady, go...!
Most women are able to have another go immediately after sex – but many find their vulva (especially the clitoris) too sensitive. Men usually can’t get another erection straight away. Some need just a minute or two to recover, while others need as long as a day or two. For the majority of men, however, the ‘refractory period’, as it is known, is somewhere in between.
the sex inspectors masterclass - Tracey Cox and Michael Alvear

How often do most people have sex?
Most people lost their virginity at 17, had on average ten sex partners, had sex over 100 times a year, and almost half admitted to unprotected sex. This was according to the Durex sex survey of 2005. The global average age for losing virginity was just over 17 years (ranging from 15 years in Iceland to 19 years in India). The global average of sex in a year was 103 (ranging from 45 in Japan to 138 in Greece; in 75% of countries surveyed the average was 97 times a year.) The global average number of sex partners was 9.9 (ranging from 3 partners in India to 14.5 in Turkey; the average was less than five partners in only 10% of countries surveyed.)
Durex: The face of Global sex 2005

Genitals are not symmetrical
Just like a man’s penis typically curves to one side, a woman’s genitals are not perfectly symmetrical either. In many women, the inner lips (labia minora) protrude further than the outer lips (labia majora). Genital skin texture varies widely from smooth to wrinkled. Nor is skin colour uniform in women’s genitals – colours range from bright pink to a dark purplish-brown. A woman’s breasts are not identical, either. One is usually bigger or hangs lower than the other.
In about 85% of men, one ball – usually the left – hangs lower than the other. The penis is often darker than the rest of the body and this is a normal part of the physical maturation process. The colour is also affected by masturbation – the more he masturbates, the darker the skin grows.
The Sex Inspectors Masterclass - Tracey Cox and Michael Alvear

A bland breakfast to stop people masturbating?
It's bizarre but true - Kellogg's Cornflakes and Graham Crackers were invented in the 19th century to help stop people masturbating and to prevent so-called excessive and abnormal sexual activity. Anti-masturbationists Will Keith Kellogg and Sylvester Graham believed that a bland diet promotes sexual restraint, and thus Cornflakes and Crackers were born. They were part of a health reform movement in the 1800s in which sex was thought to be very draining of the 'vital energies' of which we all have a limited amount, they believed, thus less sex is better.

What happens after she orgasms?
After a woman has climaxed, her swollen clitoris goes back to its normal size and position, her ballooning vagina returns to its normal length and breadth, and her uterus and cervix return to normal from the pelvic ceiling. The cervical canal, however, does the opposite. It dilates – probably to make it easier for sperm to journey into the uterus. 
the sex inspectors masterclass – Tracey Cox and Michael Alvear

Orgasms are great for menstrual cramps
If you are suffering from menstrual cramps, a great way to relieve them is with an orgasm. Menstrual cramps are caused by contractions of the muscles around the intestines and uterus. These contractions are eased by orgasms. It's perfectly safe to have intercourse during menstruation. Some women feel a surge in desire at this time of the month and simply use a towel or cloth to protect the sheets, or get frisky in the bath or shower.

Why do most men love early morning sex?
Ever wonder why many men love sex in the morning? Studies suggest that men's testosterone levels peak in the morning but drop in the evening. They also peak in autumn but decline in response to stress. Testosterone affects sexual sensation in men and women, from boosting libido to increasing genital sensitivity and strengthening orgasms.
The Good Vibrations Guide to Sex - Cathy Winks and Anne Semans

Are bald guys sexier?
It's true - bald guys have a higher sex drive. This is because their bodies produce more testosterone, which is one of the main causes of hair loss in men. The higher the testosterone level, the more likely they are to lose their hair, and testosterone is the hormone responsible for the male sex drive.
Tracey Cox - supersex

Sperm is low on calories
Ejaculate comprises only 1% sperm. The rest is made up of water and mucus - with traces of chloride, ammonia, salt, citric acid, vitamin C, calcium, carbon dioxide and cholesterol. Swallowing a mouthful of sperm will add a mere 5 calories to your daily dietary intake - but you can pick up a range of STDs such as gonorrhoea, hepatitis B, HIV, chlamydia, herpes, human papillomavirus (warts) or syphilis.
supersex - Tracey Cox

Why sex post children drops off
Most women's sex drives suffer substantially after childbirth and may be low for up to a year afterwards, due to sheer exhaustion. Up to 66% of women report that the frequency with which they have sex drops after they have children. One in ten couples do not have sex in the first year after their child is born. Once their child is one year old, many couples have sex only once a week on average. 
Tracey Cox & Michael Alvear - sex inspectors masterclass

The female orgasm
It is estimated that around 75-80% of women do not achieve an orgasm without direct stimulation of the clitoris. Certain positions may rub against and stimulate the clitoris during intercourse, such as pressing her pelvis against his pubic bone, but in most cases added stimulation (e.g. with a finger or vibrator) is needed if she is to climax.

Can people have hands-free orgasms?
It is possible to achieve an orgasm without touch. Some women report that they can climax simply by fantasizing, using breathing techniques or by contracting their PC muscle. Both men and women have reported being able to experience orgasms in their sleep, including some who have no sensation in their genitals due to spinal cord injuries. Some with nerve damage have even reported having orgasmic sensations in other parts of their bodies.
The Big Bang: nerve's guide to the new sexual universe - the writers at nerve

Signs a woman has just had sex
There are tell-tale signs in a post-coital woman. In the first 20 minutes afterwards, many women experience a glow to the cheeks and their lips swell due to an increase in blood pressure. Unbelievably, the little toe on their left foot turns red post-coitus. She will blink rapidly and breath more quickly immediately afterwards, but a day later she will be breathing and blinking more slowly than normal.
Tracey Cox - supersex

Penis facts
Most penises grow to around the same length when erect - the smallest penises may even double in size. The average length when erect is 13-15cm and when flaccid, 5-10cm. The average man has 7 erections a day, about 5 of them when asleep. On average, men can keep an erection for 40 minutes and the younger the man, the longer he can keep it up.
Tracey Cox - supersex
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Learn how to boost your sex life...
Premature ejaculation: techniques to delay his orgasm
Foreplay: why this is sex for women plus great foreplay techniques
Kissing: why it arouses women
Painful sex: why sex sometimes hurts a woman
Dry humping: a saucy alternative to penetrative sex
How to please a woman orally: the lowdown on great cunnilingus
How to give him great oral sex: fellatio techniques and tips
The art of a seductive striptease: how to do it like a professional
Are you ashamed of your genitalia? here's why you shouldn't be
Masturbation: why a little self loving goes a long way
"Tell me I've been a bad boy...!" how to ask for the sex you want
Anal play: why is it a growing trend and how to go about it safely
Female orgasm: all about the clitoris, the G-spot and female ejaculation
The clitoris: where to find it, how it works, how to stimulate it
The G-spot: how to find it, how to stimulate it
Female ejaculation: what it is and how and why it occurs
Erection problems: why impotence occurs and what to do
The secret to stronger orgasms: Kegel exercises for him and her!
Lubrication enhances pleasure: why you should use it - and lots of it

Read our fascinating sex tips...
Did you know...? interesting facts about sex
Spice it up tips: how to rev up your sex life
Sexual health tips: make sure you keep it healthy
Sexual Q&A: your embarassing sex questions answered
Sexcapades: our readers tell us their real sex adventures

Must-reads for toy lovers
Sex toys: what they are and how to use them
Cleaning your sex toys: how to keep them hygienically clean
Are your sex toys safe? some toy materials can be hazardous

General advice and new research
Male and female arousal: are women aroused by watching women?
Do all women have a G-spot? what new research says
Intersexed babies: what to do if your child is one