Wet dreams usually occur in young guys who are just becoming able to ejaculate semen. I've heard some guys say that they had orgasms in their sleep even before they could ejaculate....so I guess those would be called dry dreams? Anyway, usually as a teenager, even if you masturbated a lot, there was such a high level of sexual excitement/arousal going on, that wet dreams could occur. The longer one went without ejaculating, the greater the chance of a wet dream. You most likely have had very sexual dreams in which you came. Maybe your semen dried before you awoke? Maybe you slept naked and didn't notice the wet spot on the sheets? The only thing I would worry about was if you have a difficult time ejaculating. If you aren't coming during sex, and you aren't masturbating, eventually I would think you would have a wet dream. But the older you get, the less likely wet dreams are to occur. They were a bit problematic at times, but I loved the dreams that went with them. I wish I had more of them now!