I'm the opposite.
I guess I grew up thinking things were really weird, or uncommon. Why? because no one in my social circles talked about stuff, they subscribed to your philosophy of mystery or whatever.
Personally I've been a much happier person since I've started living life a little more open, more free, I realized that many other people enjoy the same things I do, and that there is no reason to be embarassed or ashamed about certain things that are almost inherant to people in general.
Sex has been glamorized by some, demonized by others. Its been manipulated for many purposes.
When I post about sex on here, its not because I am trying to impress people, who gives a fuck, I'll make up anything I want and post pictures of shit that is not mine and say it is if that was what I wanted to do.
Generally I post sexual stories for two reasons:
1) its interesting to see when people on here have shared similar experiences
2) I know some people find them enjoyable to read, and a turn on
I don't post them to make other peopel feel bad about their own lack of sex, and if that is happening I am sorry and all I can say is don't read them if its going to make you feel shitty.