hello Thanks for query . You are recently married and want to prolong duration of erection of your penis while having sex with your wife . Erection is very complex process that involves central nervous system ,vascular system and spinal cord etc .Hence duration of erection is dependent on following factors 1) Mood of both the partners during sexual act 2) Response of your partner 3) Surrounding environment and privacy 4) Personal relationship between both the partners 5) Health of both the partners (Physical and Mental ) 6) Changing sex position Spending more time during foreplay does help to prolong erection . Taking Sildenafil or Cialis do help to get hard sustainable erection to have enjoyable sex for longer duration Dr.Patil.