When you don't masturbate, you get horny. Eventually you get more horny. When you're very horny, your penis may tend to be a little bit longer, maybe at most a half inch or a full cm. I'm not sure why this is, though, although it does happen.
When you're horny, or when you haven't masturbated in awhile, the orgasm is more intense because you saved up cum and more will come out (which feels damn good) and because
our bodies are made to where if we are really aroused (just like animals) we really want to mate, so more cum naturally comes out in order to ensure reproduction.
Its a bit long, but it's the truth, man