Why is his peen already wet?

So I have a new boyfriend and I’m fairly new to the dating world too, as in I haven’t really done much sexually with any guys so I’m not 100% sure on what I’m doing. BUT I give it a go anyway and you gotta learn and we’re taking it real slow anyway because I’m his first gf too. But I’ve noticed when we’re messing around, I’ll go to put my hand on his peen and it’s already wet down there and I don’t know if it’s normal or not. Like if it happened once I wouldn’t bat an eye but I’ve noticed it a couple of times now. Should I be worried?