There are many factors at play, need to ask a few questions before diagnosing a problem. You (as a couple) might receive help from marriage councelling or there might be a problem with sexual health in either of you, it might also be premature ejaculation which can be a cause of underlying mental health issue.
Next Steps
To find out what the next step should be you could consult me and discuss to recognise where the problem lies, after which you will be able to take appropriate steps to manage this further.