Sexual myths are everywhere around us – in conversations with friends, in pornography, on social media and even in educational materials. These half-truths and outright falsehoods directly affect our sexual confidence, satisfaction and even health. The problem is that many of them sound convincing and are passed from generation to generation without ever being verified. Science, research and common sense help us debunk them one by one.

Myth 1: Sex Burns a Lot of Calories

The truth: Sex does burn calories – but far fewer than the popular myth suggests. A study published in PLOS One found that the average sexual encounter burns approximately 85–150 calories during 30 minutes of activity. The problem is that most people have sex for between 3 and 7 minutes – meaning a realistic 20–40 calories burned. To burn half a kilogram of fat (3,500 calories) you would need to have sex at least 35–40 times. Sex is a wonderful experience – but not a substitute for exercise. Enjoy it as pleasure rather than a fitness programme.

Myth 2: Sex Causes Heart Attacks

The truth: Quite the opposite – regular sex is beneficial for cardiovascular health. A study in the American Journal of Cardiology found that men who have sex at least twice a week have a significantly lower risk of cardiovascular disease compared to those who have sex less frequently. The physical effort of sex is comparable to climbing two flights of stairs – moderate cardio load that is good for the heart. The risk of a heart attack during sex is only real in people with already serious vascular disease – and even then is statistically very low.

Myth 3: Men Think About Sex Every 7 Seconds

The truth: This claim would mean over 8,000 sexual thoughts per day – biologically impossible. A study published in the Journal of Sex Research found that men think about sex an average of 19 times per day – comparable to thoughts about food (18 times) and sleep (11 times). Women think about sex an average of 10 times daily. The myth likely originates from the stereotype of male hypersexuality – and is entirely without scientific basis.

Myth 4: Women Always Orgasm From Vaginal Penetration

The truth: Only approximately 18.4% of women reach orgasm from vaginal sex alone without additional clitoral stimulation – established in a large study published in the Journal of Sex and Marital Therapy with over 1,000 female participants. Clitoral stimulation is crucial for orgasm in most women as the clitoris – with over 8,000 nerve endings – is the primary organ of sexual pleasure. This does not mean partners are failing – it simply means female sexuality operates through a different anatomical mechanism requiring clitoral stimulation.

Myth 5: Sex Triggers Premature Labour

The truth: A 2006 study in the British Medical Journal followed 1,000 pregnant women and found that sex in late pregnancy not only does not trigger premature labour – in some women it may even delay the onset of labour. Prostaglandins in seminal fluid could theoretically stimulate uterine contractions but in practice the effect is statistically negligible. Sex during pregnancy is completely normal except in specific medical contraindications – placenta previa, premature rupture of membranes or medically prescribed sexual rest.

Myth 6: Women Become Aroused Significantly More Slowly Than Men

The truth: Research using thermal cameras to measure genital blood flow found that women and men reach physiological sexual arousal in comparable timeframes – approximately 10–20 minutes with appropriate stimulation. The perceived difference in arousal speed stems primarily from social and psychological factors – women are more likely to suppress or ignore early arousal signals due to internalised social norms. The key message: appropriate stimulation and psychological safety matter more than biological differences.

Myth 7: Excessive Masturbation Doesn't Exist

The truth: Masturbation is completely normal, healthy and beneficial. However research shows that excessive masturbation – particularly combined with pornographic content – can develop the phenomenon of porn-induced erectile dysfunction in men. The brain becomes accustomed to the visual hyperstimulation of pornography and struggles to reach the same level of arousal during real sex with a partner. Moderation and mindful use are the key concepts.

Myth 8: The Vagina Reveals How Many Partners a Woman Has Had

The truth: The vagina is an exceptionally elastic organ designed to stretch and return to its original shape – including after childbirth. Vaginal tightness depends entirely on individual physiology, oestrogen levels, the level of sexual arousal at a given moment and pelvic floor muscle tone. The number of sexual partners has no measurable effect on vaginal size or tone. This myth is biologically absurd and has historically been used as a tool for moral control over female sexuality.

Myth 9: Women Reach Sexual Peak at 30, Men at 18

The truth: The idea of a fixed sexual peak tied to a specific age is a significant oversimplification of a complex biological and psychological reality. Male testosterone levels do indeed peak around ages 18–20, but sexual satisfaction, technique and intimacy – the factors that actually determine sexual quality of life – continue to develop for decades. In women sexual satisfaction grows with better self-knowledge, increasing confidence and reducing sexual anxiety. Research shows that many women describe their 40s and 50s as their sexual prime.

Myth 10: You Can Recognise Sexually Transmitted Diseases by Appearance

The truth: Most sexually transmitted infections are completely asymptomatic for months or even years. Chlamydia – the most common bacterial STI – is symptomless in approximately 70–80% of women and 50% of men. HIV can be present without symptoms for years. Herpes may not cause visible lesions yet still be transmitted. The only reliable protection is regular STI testing, especially with a new partner, and open conversation about sexual health before new sexual contact.

Bonus: Myth 11 – Penis Size Determines Sexual Satisfaction

The truth: A study of over 50,000 heterosexual women found that approximately 85% were satisfied with their partner's penis size, while only 55% of men were satisfied with their own. Technique, communication, emotional closeness and clitoral stimulation have significantly greater effect on female sexual satisfaction than penis size. Anxiety about size primarily affects men – and is focused on comparison with the porn industry whose standards are extremely unrepresentative.

Frequently Asked Questions About Sexual Myths

Where Do Sexual Myths Come From?

Sexual myths arise from a combination of historical moral control, religious prohibitions, lack of sexual education, misinterpreted research and the influence of the porn industry. Many are passed down unchanged from generation to generation due to the taboo around openly discussing sex.

How Do We Know if Something is a Myth or a Fact?

Seek peer-reviewed scientific research from authoritative publications. Consult medical professionals or sexologists for sexual health questions. Be sceptical of claims without cited sources – especially on social media and men's and women's forums.

Do Sexual Myths Affect Mental Health?

Yes – significantly. Myths such as a normal man lasts a long time or a woman should easily orgasm from penetration lead to unrealistic expectations, sexual anxiety, shame and avoidance of open communication with partners. Sexual anxiety is one of the leading factors in sexual dysfunction in both sexes.

Conclusion – Science, Experience and Mutual Trust

Sex is far more than a physical experience – it is emotion, communication and care. Debunking old myths opens the path to better understanding of our own bodies, more realistic expectations and more fulfilling intimate relationships. Trust science, trust your own experience and trust open communication with your partner – they are reliable guides where myths only confuse.