Sex takes 3 to 13 minutes, study says

• Story Highlights
• Survey of sex therapists seeks optimal amount of time for intercourse
  
• Time doesn't count foreplay; 1 to 2 minutes rated too short
  
• 2005 study found median time for sexual intercourse was 7.3 minutes
  
• Researcher hopes to ease minds of those who think they "should last forever"
  
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