Erectile dysfunction (ED) affects 50% of men between the ages of 40 and 70. This is according to one of the largest studies on this issue, the Massachusetts Male Aging Study (MMAS).

“ED is the persistent inability to achieve and maintain an erection satisfactory for sexual activity. The key differentiator is that it is a persistent inability, it is not a temporary thing, it is not an isolated event that happened after ten pints in the pub,” explains Dr Ivor Cullen.