Eventually he becomes conditioned to turning off, and not trying, and possibly becoming temporarily impotent. Another tape entitled Timing Problems in Male Sexuality talks about this topic. Another sexual inhibitor is the excessive intake of alcohol. Too much alcohol can easily prevent a man from getting an erection. What constitutes too much alcohol will depend on the man's body size, his weight, and the rate that alcohol is absorbed into his blood stream.
Many men drink to relax and handle their anxiety before having sex.
They may get relaxed and comfortable, but my also have had enough alcohol to prevent an erection. Don't believe you're impotent or sexually inadequate if this happens to you. Let some time pass without consuming more alcohol and impotency will usually not occur. Finally, books and articles which give simple advice about sexual behavior can lead to impotency. If a man reads an article dealing with impotency and the suggestions in the book don't work for him, he could become discouraged and give up and remain impotent.