I get the tingling feeling like you get when you're almost getting to orgasm but at random times when I'm soft and not doing anything sexual is this normal?

The tip of my penis is super tingly in a good way like when you're almost ready to cum right before you go over the hill but I'm soft and not doing anything sex related lol. Random times like during class and whatnot. The tingling if I do touch it or acknowledge it radiates down my shaft into my balls lol I'm confused