Dear Prudence is an advice columnist on manners and morals along the lines of Dear Abby and Dear Margo. She can be found on the net through Slate Magazines site. Today she posted a question and answer to a woman on the Adult Diaper Fetish paraphilic infantilism and her boyfriend. http://www.slate.com/id/2191846?wpisrc=newsletter I was surprised, but very happy to see it presented in a tasteful and helpful way. There may be hope yet.
Sorry, but advice columnists for repressed straights are hardly of any help to someone who is into kink. I mean, can you imagine the kinds of things she'd say if confronted with etiquette questions about fisting, for example?
Dan Savage would give you better advice about how to go about fisting- tips on lube, etc.
Dear Prudie is about relationships and manners. So if someone were to ask her about wanting to fist their girlfriend, her response would be to talk to the girlfriend about it. Or if sheets were ruined during fisting, she'd give advice as to who replaces them. She wouldn't discount it as inappropriate- just something to be discussed in private with the person you want to share pleasure with.