Yes you can.
Teenagers and young men
In younger males, the most frequent cause is anxiety – particularly nervousness about having sex, about causing a pregnancy, or about using a condom. A lot of men in this age group complain that they ‘can’t get on with a condom’ because as soon as they try to put it on, they lose their ‘stiffy'.
Common psychological causes of erection difficulties include:
nerves - especially about performing
guilt - notably if you’re trying to have sex with somebody else’s wife
relationship problems - especially if you’re no longer keen on your partner
latent gayness - for instance, if you’re a basically gay guy, trying to have sex with a woman
depression
exhaustion.
In a lot of cases, ED turns out to be due to a mixture of psychological and physical causes.
What physical causes are there?
Common physical causes include:
deterioration of the arteries – this is a physical change which is common in older men, including those with high blood pressure
diabetes
smoking
excessive drinking (hence the phrase ‘Brewer’s droop’)
being obese and out-of-condition
side-effects of certain drugs, notably ones for blood pressure and depression
effects of recreational drugs, like cocaine.
Less common physical causes include:
excessive drainage of blood from the penis (‘venous leak’)
diseases of the nervous system
injury to the spinal cord
major surgery in the abdomen, particularly prostate operations
hormone problems, including excess production of a pituitary hormone called prolactin.
What should I do if I'm having potency problems?
If you have difficulty getting an erection, seek help. Don’t suffer in silence – as so many men do!