Being prudish is often compounding by being shy and/or introverted.
Those of you that say your are not a prude, here is a challenge. Can you openly talk about sex with your parents? If not, you're still a prude.
My mother is definitely a prude. But we definitely talked about sex before, and she is the person whom I watch Game of Thrones with.
Father is very open, and probably not a prude, but I don't talk to him about much of anything.
Honestly anytime I bring up sex/ anything sexual with my friends, they often just change the subject.