Stuffing

It is interesting and I suppose it is possible, I often wonder about the flip side, maybe there are "anorexics" who are getting as much sexual satisfaction from losing weight as we get from gaining weight...

I really have no idea to be honest, I just know that everyone is different and there is no "black and white" on any issue, so I suppose anything is possible.

I would definitely class this as a Fetish, though it could also be called a paraphilia because by definition paraphilia is only a sexual that is anomalous, i/e considered to be deviant.

Though, having said that, paraphilia is generally reserved for things that are considerably more damaging than weight gain to the involved parties.