Improving Male Sexual Health, Function & Fertility | Dr. Michael Eisenberg
Dr. Michael Eisenberg, a Stanford urologist and expert in male sexual and reproductive health, discusses declining sperm quality and testosterone, erectile dysfunction causes and treatments, prostate health, and the impact of lifestyle on male fertility and vitality. He debunks myths and offers actionable advice for maintaining men's health.
Deep Dive Analysis
21 Topic Outline
Sperm Quality Decline and Geographic Variations
Testosterone Levels and Their Decline with Age and Obesity
Impact of Cell Phones and Heat on Sperm Quality
Lifestyle Factors Affecting Sperm Quality (Alcohol, Drugs, Smoking)
High-Impact Sports, TBI, and Pituitary Function
Bicycling, Numbness, and Sexual Dysfunction
Exogenous Testosterone Therapy and Cancer Risk
Sexual and Urinary Health, Nighttime Urination
Sleep Quality and Semen Health
Sperm Analysis as a Barometer of Overall Health
Paternal Age, Puberty Trends, and Child Health Risks
Prostate Health and Urinary Symptoms Management
Male Urinary Tract Infections and Evaluation
Erectile Dysfunction Causes and Treatments
Mechanical Erectile Dysfunction Treatments and Peptides
Pelvic Floor Health and Physical Therapy
Penile Length Trends and Dihydrotestosterone (DHT)
Finasteride, Dutasteride, and Post-Finasteride Syndrome
Clomiphene and FSH Therapy for Hormonal Regulation
Varicocele and Peyronie’s Disease
Testicular Health and Cancer Risk
10 Key Concepts
Sperm Quality
Refers to various parameters measured in a semen analysis, including the amount of ejaculate, sperm count, motility (movement), and morphology (shape), all of which are markers of a man's fertility potential.
Saturation Model (Testosterone)
A theory suggesting that once a certain, relatively low level of testosterone is present in the body, all prostate testosterone receptors are filled, meaning additional testosterone beyond this threshold does not further increase prostate cancer risk or prostate growth.
Selfish Spermatogonial Selection
A hypothesis explaining why certain mutations, particularly those occurring in proliferation pathways, become more common in older men's sperm, as these mutations give sperm an advantage over others, increasing their likelihood of leading to a child.
Delayed Orgasm/Ejaculation
A condition where a man takes an unusually long time to achieve orgasm or ejaculate, typically defined as two standard deviations above the average (e.g., 20-25 minutes), or is unable to ejaculate during sexual relations.
Pelvic Floor Muscles
A group of muscles located in the perineum (area between scrotum and anus) that support the base of the penis, prostate, bladder, and rectum, maintaining tension for organ support and relaxing for functions like urination and ejaculation.
Hypospadias
A congenital condition where the urethral opening (meatus) is not at the tip of the penis but located along the underside of the urethra, sometimes even in the scrotum, occurring in about 1% of births.
Post-Finasteride Syndrome
A condition experienced by some men who take finasteride or dutasteride, characterized by persistent sexual dysfunction (e.g., low libido, erectile dysfunction) and other issues that do not resolve even after discontinuing the medication, with mechanisms still largely unknown.
Clomiphene
A selective estrogen receptor modulator (SERM) that blocks estrogen receptors, primarily at the pituitary and hypothalamus, leading to increased production of FSH and LH, which in turn stimulates the testes to produce more testosterone and potentially sperm.
Varicocele
A common condition involving dilated veins in the scrotum, which can warm the testicle or impair metabolite clearance, potentially leading to lower sperm counts, discomfort, and in kids, stunted testicular growth.
Peyronie's Disease
A condition characterized by scarring within the penis, which causes curvature or deformity during erection due to asymmetric swelling of the erectile tissue, often resulting from injury or surgery.
17 Questions Answered
The evidence is controversial, with some meta-analyses suggesting a decline over the last few decades, while other longitudinal studies in specific regions show stability, making it a complex and debated topic.
Male factors contribute to approximately half of all infertility cases, yet men are often bypassed in initial fertility evaluations.
Yes, testosterone levels generally decline by about 1% per year after the early 20s, and obesity is a convincing explanation for some of this decline due to increased aromatization of testosterone to estrogen in fatty tissue.
While the data is not entirely convincing for testosterone, some studies suggest a potential increase in sperm DNA fragmentation with close cell phone proximity, and heat exposure from laptops is generally advised against for sperm health.
Very high levels of alcohol consumption (e.g., above 20 drinks per week) have been linked to lower semen quality, but moderate consumption has a less strong association, and it's often confounded by other lifestyle factors.
Some studies suggest that daily cannabis use can lead to significantly lower sperm concentration, motility, and morphology, though other data show a null effect, possibly due to variations in composition, frequency, and method of use.
Prolonged cycling (e.g., over 5 hours/week) may reduce sperm counts due to heat, and saddle pressure can compress nerves and blood vessels to the penis, potentially causing numbness or erectile dysfunction in some susceptible individuals.
No, current convincing data from longitudinal studies spanning decades indicate that testosterone therapy does not increase a man's risk of prostate cancer, likely due to a 'saturation model' where prostate receptors are filled at relatively low testosterone levels.
Yes, there's a U-shaped relationship where both insufficient sleep (less than 7 hours) and excessive sleep (more than 9 hours) are associated with lower semen quality, with 7-9 hours being ideal.
Yes, semen quality is considered an excellent marker for overall health, with studies showing links between lower semen quality and higher risks of heart disease, diabetes, cancer, and mortality, suggesting it could be a 'sixth vital sign'.
Yes, obtaining an early sperm analysis can provide a useful baseline and serve as an important early health indicator, similar to checking blood pressure or lipid levels.
Yes, older paternal age is linked to increased risks of neuropsychiatric conditions like autism, bipolar disorder, and schizophrenia, as well as higher risks of certain cancers in adult children, possibly due to accumulated mutations and epigenetic changes in sperm.
Most cases of ED are organic and related to blood flow issues caused by conditions like high blood pressure, diabetes, and atherosclerosis, with hormonal issues accounting for less than 10% of cases.
Assuming lifestyle and medical conditions are optimized, oral phosphodiesterase inhibitor therapy (e.g., sildenafil/Viagra, tadalafil/Cialis) is typically the first-line treatment, helping 60-70% of men.
Yes, a consistently split urine stream can indicate an issue such as a urethral or prostatic problem, or inadequate speed of urine flow, and should be evaluated by a physician.
A recent study found that average erect penile length has been increasing over the last 30 years, a surprising finding given expectations of decline due to environmental factors or obesity.
While effective for some, these DHT blockers can cause sexual dysfunction (low libido, erectile dysfunction) and dramatically lower sperm counts in some men, with a subset experiencing 'Post-Finasteride Syndrome' where these effects are permanent even after stopping the medication.
41 Actionable Insights
1. Prioritize Overall Health
Take ownership of your overall health, as comorbid conditions like obesity, hypertension, and hyperlipidemia are linked to a decline in testicular function, including lower testosterone and sperm quality.
2. Maintain Healthy Body Weight
Maintain a healthy body weight, as there is a strong link between a man’s reproductive function and body weight, with obesity potentially contributing to declining sperm quality and testosterone.
3. Optimize Sleep Duration
Aim for 7 to 9 hours of sleep per night, as both too little and too much sleep can lead to lower semen quality and negatively impact broad testicular function.
4. Increase Daily Physical Activity
Increase your daily physical activity, such as step count, as being more active is associated with higher testosterone levels and improved testicular function.
5. Hydrate with Electrolytes Daily
Dissolve one packet of Element (electrolytes) in 16-32 ounces of water first thing in the morning and during physical exercise to ensure proper hydration and electrolyte balance, which is critical for optimal brain and body function.
6. Minimize Chemical Exposure
Avoid exposure to chemicals like phthalates and BPA, as preclinical studies suggest they may harm reproductive function in both men and women.
7. Avoid Smoking
Do not smoke, as numerous studies link smoking to lower sperm quality across all measures and a longer time to achieve pregnancy.
8. Avoid Illicit Drug Use
Avoid illicit drug use, as it can negatively affect semen quality.
9. Limit Daily Cannabis Use
Limit or avoid daily cannabis use, as studies show it can lead to significantly lower sperm concentration, motility, and morphology.
10. Moderate Alcohol Consumption
Moderate alcohol intake, as very high levels (above 20 drinks a week) have shown some negative effects on semen quality, though the association is less strong than with smoking.
11. Monitor Alcohol Flushing Response
If you experience skin flushing when consuming alcohol, be aware that alcohol may have more harmful effects on your sperm parameters due to genetic variations in alcohol metabolism.
12. Minimize Scrotal Heat Exposure
Avoid external heat sources to the scrotum, such as hot tubs, saunas, and potentially seat warmers, as testicles need to be cooler for optimal sperm production.
13. Cool Scrotum in Sauna
If using a hot sauna for 20 minutes or more, consider using a cold pack in the groin area to cool the scrotum and potentially mitigate negative effects on sperm production, being careful to avoid frostbite.
14. Avoid Laptop on Lap
Place laptops on a desk rather than directly on your lap to minimize heat exposure to the testicles, as heat can negatively impact sperm production.
15. Moderate Cycling, Stand Periodically
Limit cycling to less than five hours a week and stand up in the saddle periodically to dissipate heat, as prolonged saddle time can lower sperm counts.
16. Adjust Cycling for Discomfort
If experiencing pain, numbness, or sexual dysfunction from cycling, consider changing saddles or riding style to minimize pressure on blood flow and nerve supply to the penis.
17. Get Testosterone & Semen Screened
Get screened for testosterone levels and semen quality, as these are important barometers of overall health and cannot be predicted by appearance alone.
18. Test Sperm; Don’t Assume Health
Do not assume your sperm are healthy simply because you can ejaculate; a formal test is the only way to know sperm concentration, movement, and shape, as many men have low or absent sperm without knowing.
19. Obtain Baseline Sperm Analysis
Consider getting a sperm analysis in your 20s or 30s to establish a baseline, as more information is always good and it can serve as an early indicator of overall health.
20. Consider Sperm Cryopreservation
If you are an older father (e.g., over 40) or plan to delay conception, consider freezing sperm due to potential age-related genetic and epigenetic changes that may increase risks for offspring.
21. Understand Testosterone Therapy Risks
Be aware that testosterone therapy can significantly lower sperm production and should be considered carefully, especially for men of reproductive age, and discuss this with your provider.
22. HCG with Testosterone Therapy
If on testosterone therapy and concerned about fertility, a low dose of HCG (500-1000 units every other day) can be used to stimulate endogenous sperm production.
23. Clomiphene for Low Testosterone
Clomiphene, an off-label selective estrogen receptor modulator, can augment the body’s own testosterone production without suppressing sperm production, making it a worthwhile treatment for reproductive-age men with symptomatic low testosterone.
24. FSH for Sperm Production
Follicle-stimulating hormone (FSH) can increase sperm production and is a more logical treatment than HCG for this purpose, but its high cost ($2000-$3000/month) often limits its use.
25. Caution with DHT Blockers
Exercise extreme caution when considering finasteride or dutasteride for hair loss, as these drugs can cause sexual dysfunction, low libido, and a potentially permanent ‘post-finasteride syndrome’ in some men, even after cessation.
26. Monitor Estrogen Levels
Monitor estrogen levels, especially if obese, as excessive aromatization of testosterone to estrogen can lead to issues like gynecomastia.
27. Check Prolactin for Low T/Sperm
If experiencing symptoms of low testosterone, sexual dysfunction, or very low sperm production, get prolactin levels checked, as hyperprolactinemia can be a rare but treatable cause.
28. Consult Doctor for Dysfunction
If experiencing abnormal sexual function (e.g., not getting normal erections) or bothersome urinary symptoms (e.g., frequent night urination, weak stream), consult a physician for evaluation.
29. ED Signals Broader Vascular Risk
If experiencing erectile dysfunction, even if resolved with medication, see a primary care doctor to be screened for underlying vascular issues like high blood pressure, abnormal lipid levels, and fasting blood glucose, as ED can be an early marker for broader cardiovascular disease.
30. Treat ED with Oral Therapy
For erectile dysfunction (ED) primarily caused by blood flow issues (not hormonal), first-line treatment often involves oral PDE5 inhibitors like sildenafil (Viagra) or tadalafil (Cialis), which help 60-70% of men.
31. Consider Low-Dose Tadalafil for Urinary
For men bothered by urinary symptoms, low-dose tadalafil (2.5-5mg daily) can help improve these symptoms and also offers the added benefit of improving erectile function.
32. Manage Fluid Intake for Prostate
To manage urinary symptoms related to prostate enlargement, avoid drinking a lot before bed, and be aware that spicy foods, acidic foods, caffeine, and alcohol can irritate the bladder and increase urination frequency.
33. Evaluate Persistent Split Urine Stream
If you consistently experience a split urine stream, consult a physician for evaluation, as it could signal a urethral or prostatic issue that can be improved.
34. Evaluate for Varicocele
If experiencing infertility, scrotal discomfort (worse at end of day or with activity), or if a varicocele is present, get evaluated as it’s a common cause of infertility and can cause progressive damage to testicular function.
35. Treat Peyronie’s Disease
If experiencing penile curvature or deformity due to Peyronie’s disease, be aware that treatments like collagenase injections, stretching devices, or surgical options are available to correct the issue.
36. Perform Testicular Self-Exams
While national guidelines discourage routine testicular self-exams due to potential anxiety, if you are concerned, perform self-exams and consult a physician if you identify any firm, painless masses or changes in testicular size.
37. Consider Penile Implants for ED
For severe erectile dysfunction, surgical penile implants (non-inflatable or inflatable) are available options to achieve a rigid erection when desired.
38. Consult for Pelvic Floor Therapy
Consult a pelvic floor physical therapist if you have specific needs like prostate cancer rehabilitation or if you have an overly tense pelvic floor, as Kegel exercises are not universally beneficial and can be harmful if misused.
39. Restore Energy with NSDR
Engage in yoga nidra or non-sleep deep rest (NSDR) sessions, even for just 10 minutes, to greatly restore levels of cognitive and physical energy.
40. Consult PCP/Urologist for Testing
Consult your primary care physician or a urologist to explore options for getting male reproductive health tests, such as hormone profiles and sperm analysis, covered by insurance.
41. Advocate for Male Health Coverage
Advocate for increased insurance coverage for male reproductive health testing, as men lack the automatic feedback of menstrual cycles and often need testing to identify potential issues.
3 Key Quotes
I always tell men, as long as you have a penis, we can always make it hard.
Dr. Michael Eisenberg
No one knows your scrotum better than you. So if you identify, you know, a problem, you should bring it to attention.
Dr. Michael Eisenberg
Nothing gets better with age, right? And that's mostly true, although they pointed out that, um, salary often goes up with age and wisdom goes up with age.
Dr. Michael Eisenberg
1 Protocols
Penile Injection for Erectile Dysfunction
Dr. Michael Eisenberg- Learn how to administer the injection in a clinical setting.
- Perform the first injection with a clinician, aiming to achieve an erection lasting 20-30 minutes.
- Increase the dose at home as needed until an erection lasts for the desired amount of time.