My toothless cat is becoming a biter? Why?

Question #3000 I have asked about Barnabus here on Fluther.

My cat has no teeth but as of late he has begun biting me a LOT. He’s always been a licker. He’s constantly grooming me. But as of the past few months he will lick me a couple times, and then bite the same spot a couple times. Move on to somewhere else, lick, then bite. I actually like the way it feels, obviously it doesn’t hurt cause he’s just gumming me. But I do wonder, is he doing this because his gums are bothering him? And if so can I offer some relief? And if not, why is he doing it? It is bizarre. Should I get him a chew toy? (That question even sounded ridiculous as I typed it)

This is just a curiosity mostly. As always, thanks to you other cat freaks out there who answer all my dumb little cat questions like this one.