Difficulty in ejaculating is known by doctors as retarded ejaculation. Although men with this problem may be fully sexually aroused during sex and enjoying the stimulation, orgasm seems to take for ever and may not happen at all.
Retarded ejaculation (RE) can be a very distressing condition and make men feel embarrassed, isolated, confused and very frustrated.
Partners often blame themselves and feel inadequate, which puts even more pressure on the man to perform and compounds the problem.
Some men may have had the condition all their life, in all sexual situations. Some will have no problem when masturbating alone but tense up completely with a partner. Others may only have the problem during intercourse.
If you experience retarded ejaculation when you're masturbating as well as with a partner, then the cause may be physical (diabetes, nerve damage, prostate disease, alcohol abuse, prescription drugs such as betablockers or antidepressants).
The most common causes of RE are psychological, the mind blocks the physical sensations and prevents ejaculation. Your body is telling you you're ready - you have an erection to prove it - but your head may be trying to tell you something else.