PILLAR · ERECTILE FUNCTION & PERFORMANCE
Erectile function is 80% vascular. Treat it like a cardio metric.
Erectile function is one of the most sensitive real-time readings of vascular health you can get. It reflects endothelial function, nitric oxide availability, autonomic tone, and psychological state - all at once. This pillar covers how to score it (IIEF-5), why the physical / psychological split matters, how the numbers change by decade, and what the evidence actually supports.
How an erection actually happens
An erection is a vascular event with a neural trigger. Arousal produces parasympathetic signalling, which releases nitric oxide in the corpora cavernosa. Nitric oxide relaxes smooth muscle, arteries dilate, blood inflow rises, and the veins compress under pressure to hold the blood in. Anything that impairs any step in that chain - endothelial dysfunction, low NO availability, sympathetic overdrive from anxiety, low arousal signalling - shows up as reduced function.
IIEF-5 - the 60-second validated score
The International Index of Erectile Function (IIEF-5, or SHIM) is a 5-question validated survey that clinicians use to assess erectile function. It scores 5 to 25: 22-25 is no dysfunction, 17-21 is mild, 12-16 is mild-to-moderate, 8-11 is moderate, 5-7 is severe. Take it every 30 days rather than every day - it captures a stable functional baseline that daily tracking cannot.
Psychological vs physical ED
The classic clinical split. Physical (organic) ED tends to be gradual, present in all contexts, and coincides with reduced or absent morning erections. Psychological ED tends to be sudden, situational, and preserves morning erections. The presence or absence of nocturnal quality is the single fastest triage question - which is why every serious clinic asks it before ordering tests.
ED by decade - 30, 40, 50
In the 30s, real ED is uncommon and almost always overlaps with a specific stressor, training block, or lifestyle window. In the 40s, endothelial function starts to matter as much as psychology - cardio and metabolic health become primary levers. In the 50s and beyond, vascular disease, medication side effects, and testosterone decline become common contributors. The through-line: cardiovascular status is the strongest single predictor of erectile function across every decade.
What the evidence supports
PDE5 inhibitors (sildenafil, tadalafil) are the most-studied and highest-effect intervention - they raise NO signalling downstream. They do not fix root causes. Pelvic floor training has meta-analytic support for mild-to-moderate ED - low-cost, no side effects, worth trying. Cardiovascular training raises endothelial function measurably in 8-12 weeks. Losing 5-10% of body weight in men with metabolic syndrome improves IIEF scores in most controlled trials. Most supplement stacks do not.
When to see a specialist
Sudden onset ED with no obvious trigger, especially with lost morning erections, warrants a full workup - it can be an early sign of cardiovascular disease. Bring the data: 30 days of daily inputs plus an IIEF-5 gives a urologist a far clearer picture than a single-visit intake ever will.
WHAT YOU GET
Built for signal, not noise.
Vascular first
Endothelial function is the dominant driver. What is good for your heart is good for erections.
Validated scoring
IIEF-5 is the standard. Retake monthly, track the trend, share with a clinician if needed.
Cardiovascular flag
New-onset ED can precede a cardiac event by 3-5 years. It is a signal worth taking seriously.
READ NEXT
Keep going.
QUESTIONS
What people ask before signing up.
What is a normal IIEF-5 score?
22-25 indicates no erectile dysfunction. 17-21 is mild. Below 17 warrants attention - and, if persistent, a doctor.
How do I know if my ED is physical or psychological?
The first triage: do morning erections still happen normally? If yes, the underlying plumbing is working and the issue is more likely psychological or situational. If no, physical causes climb the list.
Do PDE5 inhibitors damage anything long term?
No consistent evidence of harm from properly prescribed PDE5 use in men without contraindications. They should be started with a physician - especially if you take nitrates or have cardiovascular disease.
Do pelvic floor exercises actually help?
Yes, with meta-analytic support for mild to moderate ED. 3 sessions per week, 8-12 weeks minimum. Low cost, no side effects, worth doing.
Can cardio really improve ED?
Yes. 150 minutes per week of moderate-intensity cardio improves IIEF scores in most trials, with effect sizes visible in 8-12 weeks. The mechanism is endothelial function and NO availability.
EARLY ACCESS
Get your baseline in 60 seconds.
Free early access. Validated IIEF-5, deterministic scoring, no diagnosis.
RELATED IN THE HUB