Something has shifted, and the numbers are hard to ignore. Rates of erectile dysfunction and low sexual desire in men under 40 have been climbing steadily for the better part of two decades. Studies published in the Journal of Sexual Medicine put the prevalence of ED in men under 40 at somewhere between 8% and 30%, depending on how you measure it, and clinicians report the figure is trending upward. This is not a story about ageing. It is a story about men in their 20s and 30s, many of them otherwise healthy, who cannot perform sexually or have stopped wanting to.
Three explanations dominate the conversation: pornography, performance anxiety, and physical health. The honest answer is that all three are probably contributing, in different proportions for different men, and nobody has a clean single-cause story yet.
The porn argument is the loudest one in public discourse. The theory, popularised partly by the NoFap community and partly by researchers like Gary Wilson, is that habitual high-speed internet porn rewires dopamine pathways, raising the threshold for arousal to a point where a real partner cannot compete. The evidence is real but contested. Some neuroimaging studies show patterns in heavy porn users that look like addiction signatures. Others dispute the methodology. What is fairly well-established is that some men report dramatic improvements in sexual function after cutting out pornography entirely, and that phenomenon is too consistent to dismiss.
Performance anxiety is the other giant in the room. A generation of men raised on smartphones, dating apps, and ambient sexual comparison has a lot to live up to in their own heads before anyone else gets involved. The anxiety itself causes the dysfunction, which creates more anxiety, which makes the dysfunction worse. It is a tight loop and it does not need a physical cause to be completely debilitating. Psychosexual therapists report that this is now one of the most common presentations in their practices among men under 35.
The physical causes are less discussed but genuinely significant. Poor sleep, chronic stress, ultra-processed diets, sedentary work, heavy drinking, vaping, and low testosterone are all measurably associated with erectile problems. Testosterone levels in men have been declining across the general population for decades, with studies from the US and Europe showing average levels dropping roughly 1% per year since the 1980s. The causes are still debated, endocrine disruptors in plastics, obesity rates, and lifestyle factors all feature in the research, but the decline is real and not explained by age alone.
What men actually do about it varies wildly. The pharmaceutical route is easy and cheap now: generic sildenafil (the active ingredient in Viagra) runs about £1 to £3 per pill through legitimate UK online providers, and tadalafil (Cialis) is similarly accessible. These work well for physically-rooted dysfunction and can help break the anxiety loop in psychological cases, but they do not fix the underlying issue. Testosterone replacement therapy is available through the NHS if blood tests confirm deficiency, though the threshold for prescribing is conservative, and private clinics offering TRT have multiplied rapidly, with costs running roughly £80 to £200 per month depending on the protocol.
A GP appointment is the right first step for anyone experiencing consistent problems. Blood tests covering testosterone, thyroid function, blood glucose, and cardiovascular markers can rule out or identify physical causes quickly. If everything comes back clean, a referral to a psychosexual therapist is worth pursuing seriously, not as a last resort. The waiting list on the NHS can stretch to several months; private sessions run £70 to £150 per hour.
The stigma is the real obstacle. Most men experiencing this say nothing to anyone for months or years. That silence is costly, because most of the causes are either treatable or manageable once identified.
