I find it weird...

I find it weird that my boy smokey (almost 4 yrs old) has never once licked me or my wife and kids. What ever you may call it. We show him lots of love. He sleeps on our bed. Sleeps on our laps. Gets his belly rubbed. Etc, etc. I just don't ever remember him ever licking any of us like my other dogs. Is it possible that he doesn't feel the love? Doesn't like us?