Are fetishes sexual?

Here is something I just wrote in a youtube video. I like the way it came out. I really need to expand it though. It is tough to express a complex and still coherent thought in 500 characters.

Hard data is difficult to come by, but what does exists suggests that most fetishes develop before puberty. A fetish is just something weird that makes you happy. It is not that the fetish object is "sexy" but that being happy increases your libido. For vanillas as well as kinky folks, this might include dancing or walking on the beach or eating foods they enjoy.

When a person grows older they might or might not incorporate sexual activities into their fetish.