Probably depends and is different for everyone. I do think we get to know ourselves over time and that would contribute to it being 'better'.
It does for a young man, particularly if he's not using porn and not having premarital sex, but just enjoys the pleasure of it. But a few weeks before he gets married, his hand won't do the job anymore. That's natural because he's seriously anticipating sex for the first time. And I can tell you from experience, without bringing sexual baggage into our marriage, sex has just gotten better and better for decades. I'm not making this up, either. I had a blast masturbating for 12+ years before I got married and once married, I still feel like I'm on my honeymoon because everything was completely new for me on our wedding night. That "newness" has never worn off.