Our expert says:
The causes could be due to medication and their side effects (antidepressants, tranquilizers, antihistamines may cause ejaculation problems), alcohol or other drugs, some diseases like diabetes, anxiety or depression. Worrying about it may worsen the condition and even cause impotence. He can go to his GP for a medical check up to exclude any medical causes, but otherwise I think you should try to avoid putting any pressure on him to "perform".
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