So at five years old, these kids were reading the news about Clinton's impeachment? That's about how old they were at the time.
Besides, blow jobs weren't really considered sex when I was in high school, and that was a few years before Clinton.
Oral sex was definitely considered sex when I was in high school, and that wasn't much before Clinton, either. As far as today's 14- and 15-year-olds, they were 7 or 8 during the height of impeachment, certainly old enough to watch the omnipresent TV news go on and on and on about it. Moreover, they would be surrounded by the culture accepted by the older children who could not have missed it; and the oral-sex-is-not-sex meme has been repeated endlessly since.
WJC is squarely responsible for the current crop of children who are under the illusion that oral sex isn't really sex.