This attitude is also being forced on people through media. Modern media seems almost allergic to the concept of even acknowledging that sex is a thing people do. Then, you look at the ways people self-censor on YouTube to avoid demonetization, where they won't even say the word sex. I see young people today who are shocked by movies and HBO TV shows from the 90s, 00s, and early 10s.
I watch mostly comedies a d crime stories on Netflix and there is no shortage of sex scenes. I am not deliberately searching them out, they just are there basically randomly.
I genuinely do not know what you are talking about heremaybe except "this person is consuming wastly different media".