How in depth when talking to friends about hook ups?

[The Colossus]

How in depth do you discuss sex/hook-up/relationship issues with your closest friends?

The reason I ask, I have hooked up with 2 rather conservative girls (friends of friends of friends) over the summer, and I haven't told my friends anything about what happened, and yet they seem to know what happened down to the last detail.

I don't have a problem really discussing relationship advice, but I'm not usually one to "kiss and tell" with my closest friends. Standard or no?