Abstinence is the only birth control method that has a zero percent failure rate for an unplanned pregnancy and 100 percent rate of protection against stis. thirty years ago, there were only two common and easily treated stis.

Thirty years ago, there were only two common and easily treated STIs, they are Syphilis and Gonorrhea, which are very easily treatable with some antibiotics

Dangerous STIs such as Chlamydia ( which is very dangerous to woman) and HIV ( which is very dangerous because it will destroy your immune system) just started to developed in the 1980s