For some men, long hours on a saddle can contribute to erection problems, but the research behind that worry is small and dated, and the NHS names several other common causes. The UK’s National Health Service lists taking a break from cycling, if you ride more than 3 hours a week, among its lifestyle steps for erectile dysfunction (ED). If erection problems keep happening, the right next step is a GP (family doctor) or a sexual health clinic, not a new saddle. Everything below reflects the NHS page as read in October 2026.
What the NHS line says, and what it leaves out
The NHS calls ED very common, particularly among men over 40. It means either not getting an erection or not holding one long enough for sex.
Cycling shows up in the “Don’t” half of the lifestyle advice, alongside drinking above 14 units of alcohol weekly. For anyone riding more than 3 hours a week, the advice is to take a break from cycling for a while. The “Do” half says to exercise daily, lose weight if you are overweight, stop smoking and eat a healthy diet. Read together, it points to trimming saddle time, not giving up exercise.
Two limits are worth knowing. The page gives no reason and no study for the 3-hour figure, and it says “for a while”, not permanently. Also, the page shows it was last reviewed on July 28, 2023 with the next review due July 28, 2026, a date that has now passed.
Why a saddle could matter
The perineum is the stretch of groin behind the scrotum. Harvard Health Publishing explains the mechanism this way: a chair shares your weight between both buttocks, but a bicycle saddle loads the perineum, which carries the nerves and arteries serving the penis. Harvard blames nerve damage for penile numbness in male riders and says squeezing the pudendal artery on top of that nerve damage can cause ED that is brief or longer-lasting.
Harvard also puts numbers on it: up to 66% less blood reaching the penis on a narrow saddle, and possibly 25% less even on a broad one. It is an archived post from September 14, 2012 and does not name the study behind those numbers, so treat them as a sign of the direction of the effect, not a measurement of your own saddle.
What the studies found, and what they did not
| Study | Who took part | Reported finding and limit |
|---|---|---|
| NIOSH report on patrol officers | Bicycle-patrol police; Harvard counts 17 officers in a Cincinnati unit who spent nearly 5½ hours a day in the saddle on average | Perineal pressure tracked with genital numbness and with less time spent having erections in sleep. Officers with the most riding time carried the greatest ED risk, and those who pushed hardest on the saddle had the most trouble. Very small group, very long riding days. |
| Norwegian questionnaire study | 160 male respondents after a Norwegian touring race of 540 km (Harvard’s summary says some 324 miles) | About 20% said their penis went numb afterward, in some cases for more than a week. 21 men (13%) reported ED; the original paper says it lasted over a week in 11 of them, while Harvard’s summary says it generally did. |
| NIOSH saddle study, June 2004 | 33 volunteers on a stationary bike, comparing three noseless saddles with a traditional sport saddle | Saddles with no protruding nose gave significantly lower groin pressure, which has been linked to one measure of ED. Stationary bike only; NIOSH says the study cannot give a conclusive answer on risk. |
The common thread is riding volume plus saddle pressure. Harvard says the worry is mostly relevant to heavy riders. NIOSH says reports of impotence and genital numbness among some cyclists prompted the question, and that its own study cannot settle it. Its researchers expect lower perineal pressure to reduce erectile problems among people who ride for work, but say road testing is still needed, including on whether noseless saddles affect handling, stability and weight distribution.
Scale matters here. The patrol officers spent nearly 5½ hours a day on the saddle, on average, which is already more than the NHS weekly figure. It is not obvious those results transfer to a recreational rider. The sources also differ on specifics: the NHS names a weekly number, while Harvard and NIOSH name no safe or unsafe amount of riding.
Check the other causes first
According to the NHS, an erection that fails now and then is common and not a cause for concern; the usual culprits are stress, fatigue or overdoing the alcohol. Some medicines can also cause it. If it happens often, the page lists conditions such as high blood pressure or high cholesterol, diabetes, depression or anxiety, and hormone problems.
So a rider who notices changes should not assume the bike is the cause. A stressful month, heavier drinking or a new medicine may overlap with a heavier riding schedule.
Saddle and position changes worth trying
Harvard says you do not have to give up biking and lists some simple precautions:
- Skip racing saddles with a long, slim nose in favor of a wider, generously padded one. See our guide to choosing a saddle.
- Keep the nose from pointing up; that tilt adds perineal pressure.
- Check saddle height: at the bottom of the pedal stroke your legs should not be fully stretched out. See how to adjust saddle height and the wider bike fit overview.
- Bring the handlebars up so you sit more upright; see handlebar setup.
- Consider padded shorts, and on long rides vary your position and stop for breaks.
- Balance riding with other activity such as walking, jogging or swimming.
One caution on saddle shopping: Harvard also reports a later study of women riders in which narrow and cut-out seats raised perineal pressure. It was not done in men, but it is a reason not to assume a cut-out alone fixes the problem. NIOSH’s noseless-saddle result also came from a stationary test, so expect to experiment.
When to stop and get checked
- Erection problems that keep happening. The NHS says to book a GP visit or attend a sexual health clinic, because it may signal a treatable condition. A break from cycling can run alongside a check-up; it should not replace one.
- Tingling or numbness in the groin while riding. Harvard’s instruction is to get off the bike. If a wide, cushioned, correctly adjusted saddle does not stop it coming back, Harvard’s suggestion is a recumbent bike. Numbness that is still there after you finish riding is worth raising with a GP; in the Norwegian race data, some men’s numbness persisted beyond a week.
- Needing to urinate more often than normal alongside erection changes. The NHS says this symptom can lead to a prostate examination, so mention it.
- Online “ED pills”. The NHS warns that many websites sell fake medicines and says it is best to see a doctor first.
An NHS appointment may start with questions about your lifestyle, relationships and symptoms, followed by simple checks such as blood pressure and a genital exam to look for an obvious physical cause. This article is general information, not a diagnosis.
Sources
- NHS: Erectile dysfunction (impotence)
- CDC NIOSH: Bicycle Saddles Without Protruding Noses Reduce Pressure Associated With Erectile Dysfunction Measure, Study Finds (2004 update)
- Harvard Health Publishing: Biking and sex—avoid the vicious cycle (archived, 2012)
- PubMed: Impotence and nerve entrapment in long distance amateur cyclists (Andersen and Bovim, 1997)
- PubMed: Women’s bike seats: a pressing matter for competitive female cyclists (Guess et al., 2011)
Last reviewed: October 2026.