Inserting AdSense code into the single post template loop? Each time a new post is created and published predefined AdSense blocks automatically populate inside the post. i.e. no more copying AdSense code inside each post. No more half legged plugins. Just easy breezy AdSense. Sure all themes are different but they all work inside the loop, right? Where would this code be inserted, what other parameters need to be configured, And would css get involved????
Just curious, why are you against using a plugin? They are quite a few that will help you integrate Adsense into your blog posts...
Edit your single.php and place your adsense code as follows, CSS and Other parameters will come into account as per your requirements