Book excerpt: Self-described pervert Katherine Gates takes an anthopological look at the explosion of extreme fetishes and post-modern eroticisms in this lavishly illustrated guide to some of the most obscure and fascinating sexual subcultures. Here are just a few of the strange and convoluted erotic turn-ons included: Pony riding academies, cybersex and its permutations, a man whose fetish is to costume himself as a thanksgiving turkey and get cooked in an oversize oven. Also includes interviews with John Waters, Clive Barker, and Harold Schecter.