I liked to play with it when I started masturbating. It feels delightful when you're aroused and relaxed and you're in the shower and bathing and washing and getting everything nice and squeaky clean.
When my first girlfriend was blowing me, she had taken an interest in licking my balls and she ended up swiping me with her tongue and she gave me a great blowjob, I was so aroused, I just exploded right there.
I didn't even know what to say, and she asked if I liked it, and I decided to nod than deny it, and she ate my ass. She didn't really penetrate it in any significant way, but it felt so incredible.
Also the pleasure from assplay and perineum play ultimately (long story) helped me learn how to control my orgasms better.
Sexual pleasure that occurs right behind the balls, and includes the penis, and balls is fantastic and muscle control allows you to hold the orgasm partially off so you can stop the cumming after a few shots, then stop things and go right to another orgasm. I eventually learned how to also make it pour out as well and even stop the orgasm totally and kind of separate the pleasure of an orgasm from the ejaculation part.
You'd think this would make me unable to squirt well, but I can shoot some good distance.