It's because how the media and society protrays sex. It looked at like something we should all be guilty of, but in actuality, it's a normal thing that most humans do in the world. Especially if it is to breed more children, and I honestly don't feel bad about talking about it with friends.
That's very encouraging to me to hear you do talk about it with friends. I'm trying to explore how much of this perspective I have is my own social upbringing and how much of it is a cultural problem which needs to be adjusted and changed in our society.