Which prevents people infected with STIs from seeking medical attention?

There are several potential reasons:

• They don't know they are infected
  
• They asked their friends and got bad advice
• They don't care
  
• They are ashamed
  
• They figure it is a god sent punishment frothier sin
• They are afraid of doctors
  
• They think they will have to pay more than they can afford
• They are afraid others will find out
  
• They see it as a chance to hurt others by passing it on
  
• They don't think treatment would help
  
• They are more afraid of treatment than the disease
  
• They believe in alternate medical practices
  
• They think they can pray their way to a cure