Welcome

Shel wrote about many different adult oriented things, including  songs about
 (for lack of any better term) 
Sex, Drugs and Rock and Roll.
 If this in any way offends you, please go back now.

If you take a look at William Shakespeare, he wrote about the same types of things in a language the people of his time could understand. 
Shel did the same for the people of this century and more.

These are just a few favorites I saw worth mentioning.
I'm not taking these into too much depth.
Shel has much more Adult works that I need not list here.  
You can get the whole schlemiel by visiting   
Shel Silverstein's Adult Works.