Swearing in books.

In real life I swear.Lost keys, a bus running late and overcooked pasta will all make me swear. We all do it.

Where the game changes is when I read. Usually the first one or two on a page stick in my mind. There are obviously characters and scenes which lend themselves to swearing - someone walking in on their lover with another for example.

I can´t imagine too many people saying:

Goodness me! Why are you in our bed with another? 

It just doesn´t cut it  in today's gritty world.

What I don´t like is swearing for swearings stake. Some authors and screenwriters push swearing prehaps to fill space. F this and F ( or maybe even C) that on every page.  On one hand,there is a strong desire to reproduce the actual or real language of the characters. On the other hand maybe people would already assume that the characters would swear - why include it in the dialogue?

I am struggling with this idea in my own work. A have a coming of age story and my main character is 22 years old. Most 22 year old males swear. I did. Trying to justify and exclude situations to minimise the swearing is proving to be a difficult task.

So here are my questions :

1) Do you acknowledge swearing in print?

2) If so, how much do you tolerate?

and most importantly

3) Is it possible to write scenes of strong conflict between adult characters and NOT include any swearing?