I have asked probably 100 adults in roughly my age range if, as teenagers, their parents ever talked to them about sex and literally only one person has ever said yes.
@codinghorror Mine did. I brought a girlfriend to my parents house when I was 15, and the second she left they tried to give me "the talk", mostly out of fear I'd do something stupid. It was mortifying at the time, but knowing that few parents cared enough to do this makes me feel grateful that they at least tried.