People quite understandably like to feel comfortable. And that's why they do whatever makes them feel good. For example, they traditionally indulge in erotic experiences for this reason.
Sometimes people want, and sometimes they expressly need, to make themselves feel good. They want to make their lives more pleasant. And one of the easiest ways to satisfy them is through sex.
As much as we teenage boys usually don't want to admit it, sex is definitely not everything in life. But that doesn't mean it's nothing to us guys.
You probably already know very well that sex is a pleasurable affair. And most likely you also know that it is not always an easy thing to get.