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26 Little-Known Facts About Sex All Men and Women Should Know
As the saying goes, “Food and sex are basic human needs.” But when it comes to intimacy, the human body holds endless mysteries—and sexual knowledge is no exception. We’ve rounded up “sex facts you didn’t know” to help boost your understanding of intimacy. Many people go their whole lives without learning these!
1.Men with higher-pitched voices have more sperm.
A study across several European countries found that while women find deeper-voiced men more masculine and attractive, these men have lower sperm concentrations than their higher-pitched peers. Women’s voices also rise during ovulation—a biological instinct to grab male attention.
A study across several European countries found that while women find deeper-voiced men more masculine and attractive, these men have lower sperm concentrations than their higher-pitched peers. Women’s voices also rise during ovulation—a biological instinct to grab male attention.
2.People who have sex regularly have better memories.
A recent study from a Canadian university found that men and women who are sexually active have sharper memories than those who aren’t. Researchers tracked 78 heterosexual couples under 30, focusing on links between sexual activity and changes in the hippocampus—the brain’s key region for emotion, memory, and neural function. Results showed frequent sex correlated with better recall of abstract words.
A recent study from a Canadian university found that men and women who are sexually active have sharper memories than those who aren’t. Researchers tracked 78 heterosexual couples under 30, focusing on links between sexual activity and changes in the hippocampus—the brain’s key region for emotion, memory, and neural function. Results showed frequent sex correlated with better recall of abstract words.
3.Your first time having sex is linked to genetics.
While losing your virginity feels like a personal choice, new research shows genes directly influence when it happens. Studies on twins—even those separated at birth—reveal strong genetic patterns in first-time sexual behavior. Traits like impulsivity, conservatism, or risk-taking, which are tied to genetics, shape this decision.
While losing your virginity feels like a personal choice, new research shows genes directly influence when it happens. Studies on twins—even those separated at birth—reveal strong genetic patterns in first-time sexual behavior. Traits like impulsivity, conservatism, or risk-taking, which are tied to genetics, shape this decision.
4.Men produce far more reproductive cells than women.
The gap is stark: Women are born with 1–2 million eggs, but by puberty, only about 300,000 remain. Just 300–400 of these will ovulate before menopause. In contrast, men produce over 500 billion sperm in a lifetime—and a healthy man releases 1.2 million per ejaculation.
The gap is stark: Women are born with 1–2 million eggs, but by puberty, only about 300,000 remain. Just 300–400 of these will ovulate before menopause. In contrast, men produce over 500 billion sperm in a lifetime—and a healthy man releases 1.2 million per ejaculation.
5.The clitoris is mostly an internal organ.
Most people know the clitoris has an external nub, stimulation of which can bring intense pleasure. But most of the clitoris lies inside the pelvis. When aroused, it swells to surround the vagina, heightening pleasure as arousal builds. The external tip, though small, is critical—it has over 8,000 nerve endings, twice as many as a man’s glans.
6.Sex can slow aging.
Couples who have sex at least four times a week look over a decade younger than average adults, according to a study from Edinburgh Royal Infirmary. “Pleasure from sex is key—orgasms release adrenaline, dopamine, and norepinephrine, which help keep skin tight and muscles relaxed,” researchers note.
Couples who have sex at least four times a week look over a decade younger than average adults, according to a study from Edinburgh Royal Infirmary. “Pleasure from sex is key—orgasms release adrenaline, dopamine, and norepinephrine, which help keep skin tight and muscles relaxed,” researchers note.
7.Soaking your feet can boost sexual arousal.
Traditional Chinese medicine highlights foot acupoints linked to libido—and a study from the University of Groningen in the Netherlands backs this up. Warm feet increased women’s orgasm intensity by 30% and sped up their sexual response. Soaking feet in warm water pre-sex improves circulation, stoking desire and enhancing pleasure.
Traditional Chinese medicine highlights foot acupoints linked to libido—and a study from the University of Groningen in the Netherlands backs this up. Warm feet increased women’s orgasm intensity by 30% and sped up their sexual response. Soaking feet in warm water pre-sex improves circulation, stoking desire and enhancing pleasure.
8.Semen is surprisingly nutritious.
A single ejaculation contains about 15 calories, with protein levels comparable to a large egg white. It also packs vitamin C, B12, calcium, magnesium, potassium, and zinc.
A single ejaculation contains about 15 calories, with protein levels comparable to a large egg white. It also packs vitamin C, B12, calcium, magnesium, potassium, and zinc.
9.Don’t have sex right after eating.
After a big meal, blood rushes to the gut to aid digestion, leaving less for sexual organs. Wait about an hour—by then, digestion eases, and blood flow shifts, making sex more satisfying.
After a big meal, blood rushes to the gut to aid digestion, leaving less for sexual organs. Wait about an hour—by then, digestion eases, and blood flow shifts, making sex more satisfying.
10.Sex helps fight colds.
Having sex once or twice a week boosts levels of immunoglobulin A (IgA), an antibody in saliva and mucous membranes that defends against germs. This strengthens immunity against colds and flu.
Having sex once or twice a week boosts levels of immunoglobulin A (IgA), an antibody in saliva and mucous membranes that defends against germs. This strengthens immunity against colds and flu.
11.Limit emergency contraception to 3 times a year.
One dose of emergency birth control equals 8 days of regular low-dose pills. Overuse disrupts menstruation, suppresses ovary function, and can even cause amenorrhea (missed periods). Stick to 3 times a year max—and no more than once a month.
One dose of emergency birth control equals 8 days of regular low-dose pills. Overuse disrupts menstruation, suppresses ovary function, and can even cause amenorrhea (missed periods). Stick to 3 times a year max—and no more than once a month.
12.Sex enhances women’s attractiveness.
During sex, women’s estrogen levels double. This “fountain of youth” hormone makes hair shinier and skin softer. Orgasms also boost blood flow, leaving cheeks flushed and lips rosier—essentially a quick beauty treatment.
During sex, women’s estrogen levels double. This “fountain of youth” hormone makes hair shinier and skin softer. Orgasms also boost blood flow, leaving cheeks flushed and lips rosier—essentially a quick beauty treatment.
13.Diet affects semen’s smell.
Food directly impacts how semen smells: Sweet fruits like kiwi, watermelon, and pineapple lighten its scent; beer and coffee make it stronger and bitter; red meat makes it oilier; acidic fruits (cranberries, plums) and alcohol add a sweeter note. Dairy, thanks to bacteria, can create an odd odor.
Food directly impacts how semen smells: Sweet fruits like kiwi, watermelon, and pineapple lighten its scent; beer and coffee make it stronger and bitter; red meat makes it oilier; acidic fruits (cranberries, plums) and alcohol add a sweeter note. Dairy, thanks to bacteria, can create an odd odor.
14.Ovulating women prefer muscular men.
During ovulation, women’s libido spikes—and they’re drawn to muscular men, even if they’re not the brightest. They may also favor slightly aggressive men for short flings (though not long-term relationships). Experts say this is nature’s way: Mature eggs 下意识 seek strong sperm.
During ovulation, women’s libido spikes—and they’re drawn to muscular men, even if they’re not the brightest. They may also favor slightly aggressive men for short flings (though not long-term relationships). Experts say this is nature’s way: Mature eggs 下意识 seek strong sperm.
15.Sleep determines sexual quality.
Quality sleep is key for good sex. Less than 6 hours a night leads to sexual fatigue; fragmented sleep (e.g., 10 hours split into 3 sessions) lowers desire. Better to sleep 7 solid hours at night.
Quality sleep is key for good sex. Less than 6 hours a night leads to sexual fatigue; fragmented sleep (e.g., 10 hours split into 3 sessions) lowers desire. Better to sleep 7 solid hours at night.
16.Afterplay matters more than foreplay for satisfaction.
Kissing, cuddling, and loving conversation post-sex are just as important as the act itself. Relationship experts link this to oxytocin, a “bonding hormone” released during sex and continued skin contact afterward. Couples who extend intimacy build stronger emotional ties.
Kissing, cuddling, and loving conversation post-sex are just as important as the act itself. Relationship experts link this to oxytocin, a “bonding hormone” released during sex and continued skin contact afterward. Couples who extend intimacy build stronger emotional ties.
17.Good sex sharpens women’s sense of smell.
Fulfilling sex triggers more neurons in the brain’s olfactory center, boosting smell sensitivity. But this only happens with exciting, not routine, sex—since the brain cells involved activate only during intense arousal.
Fulfilling sex triggers more neurons in the brain’s olfactory center, boosting smell sensitivity. But this only happens with exciting, not routine, sex—since the brain cells involved activate only during intense arousal.
18.Sex burns calories; marriage strengthens bones.
An hour of sex burns as many calories as 30 minutes of jogging! Men average 4.2 calories per minute, women 3.1—adding up to 101 and 69 calories per session, respectively. Marriage, meanwhile, is linked to stronger bones.
An hour of sex burns as many calories as 30 minutes of jogging! Men average 4.2 calories per minute, women 3.1—adding up to 101 and 69 calories per session, respectively. Marriage, meanwhile, is linked to stronger bones.
19.Too much sex reduces sperm count.
Frequent sex lowers sperm volume and density—sometimes releasing immature sperm that can’t fertilize eggs. For women prone to immune reactions, regular exposure to their partner’s semen may trigger anti-sperm antibodies, blocking fertilization.
Frequent sex lowers sperm volume and density—sometimes releasing immature sperm that can’t fertilize eggs. For women prone to immune reactions, regular exposure to their partner’s semen may trigger anti-sperm antibodies, blocking fertilization.
20.Stick to warm, not cold, after sex.
Drink warm liquids and take warm showers post-sex. During intimacy, blood vessels (including those in the gut) dilate; cold drinks or showers can shock the stomach lining, causing cramps. Cold also strains the heart, as skin vessels constrict suddenly.
Drink warm liquids and take warm showers post-sex. During intimacy, blood vessels (including those in the gut) dilate; cold drinks or showers can shock the stomach lining, causing cramps. Cold also strains the heart, as skin vessels constrict suddenly.
21.Sexually active people face higher STD risks.
About 80% of sexually active adults will get an STD at some point. Experts urge staying monogamous and using protection.
About 80% of sexually active adults will get an STD at some point. Experts urge staying monogamous and using protection.
22.Birth control changes women’s mate preferences.
The pill alters brain chemistry, making women more interested in long-term marriage than finding a sexually compatible partner.
The pill alters brain chemistry, making women more interested in long-term marriage than finding a sexually compatible partner.
23.Hard nipples aren’t always a sign of arousal.
While arousal often hardens nipples, it’s not the only cause. Cold temperatures or clothing friction can have the same effect.
While arousal often hardens nipples, it’s not the only cause. Cold temperatures or clothing friction can have the same effect.
24.Getting drunk doesn’t help sex.
A little alcohol may relax you, but being drunk harms sex—especially for men. Many mistake alcohol’s buzz for enhanced pleasure, ignoring poor physical condition. Over time, this dulls genital sensitivity and reduces sexual function.
A little alcohol may relax you, but being drunk harms sex—especially for men. Many mistake alcohol’s buzz for enhanced pleasure, ignoring poor physical condition. Over time, this dulls genital sensitivity and reduces sexual function.
25.The “stop-start” technique boosts sexual stamina.
Holding off ejaculation temporarily can improve control, lengthen sessions, and heighten pleasure. The method: Pause just before climax, contract pelvic muscles to hold back, then resume. This builds mastery over ejaculation.
Holding off ejaculation temporarily can improve control, lengthen sessions, and heighten pleasure. The method: Pause just before climax, contract pelvic muscles to hold back, then resume. This builds mastery over ejaculation.
26.Even with a partner, 78% of men and 53% of women masturbate—though few talk about it.
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