This article seems more like a placeholder for the fetish, without being particularly well-researched. Leaving aside the tone (of the site in general), which seems to treat any fetish as some sort of mental disease, the article makes many assumptions that the WAM fetish must somehow translate directly to a representation of the bodily fluids secreted during regular sexual activity.

To my mind this utterly misses the point, as while many messy substances may look or feel like natural emissions, that's an entirely different fetish, which I'd guess most wammers would find quite unpleasant.

Actually having sex underwater or when messy gives a tactile enhancement, which the writer seems to ignore.

Enjoying watching people wamming can be for a multitude of reasons--see-through/clinging clothes, or seeing pretty models "brought down to earth" can be triggers. Either way, it doesn't strike me as something that's wrong or needs to be "cured." Accepting what you like and perhaps sharing that excitement with willing partners seems to me a far more "healthy" lifestyle.