1st Question:
Are you on any mental health medicines? - they tend to effects one ability to perform sexually.

2nd Question:
Have you been under any stress at home or at work - stress is the number one killer of sexual pleasure.
The mind is your biggest sex organ, if it is stressed then so is your body.

3rd Question:
Have you talked to your doctor about this issue? - you could have a medical problem that is causing the sexual issue.

4th Question:
How old are you? - some men over forty experience these problems.