STD's In Society

I have always equated STD's with immorality, promiscuous behavior, and low social status, until about a year and half ago. My sister was constantly feeling tired and weak. She went to her physician; and, they drew blood and conducted a series of tests. They told her that she had Hepatitis C. They asked her if she had used drugs or shared needles with anyone, or had surgery in recent years. She stated, "I have never used drugs; but, I did have surgery about two years ago." The physician told her that she had obviously contracted Hepatitis C through the blood that was given to her after her surgery. She lost a lot of blood, and was given four pints. She had to take strong, expensive medication, and take shots twice a day for one year; because, of the hospital staff's negligence in testing the blood, that was given to her. So, after that, I stopped associating STD's with immorality, promiscuous behavior, and low social status. I knew that she has never been that way at all. It is very easy to believe that someone with an STD has been having sex with multiple partners and are lower class individuals, most of the time, it is true, but not in all cases.