Somewhere between infantilism and watersports fetishes lies the niche occupied by Wet Set, one of the premier off- and online resources for "Knicker Wetting, Wet Panties, Accidents, Desperation, Diapers & Nappies, Bedwetting, (and) Adult Babies". If any of the above appeals to you, you probably know about the site already; if not, the site's bulletin board and veritable flood (sorry) of video previews is a good place to start exploring a kink that's a lot more common than you think.
Wet Set Magazine (wetset.net)
Previously: Women in Diapers, Golden Boys USA