We do need to take into consideration that nearly all the material in the "Guide" section here and elsewhere is older than dirt. A majority of it was written in the early to mid '90s when one could actually use newsgroups. There is a small amount of factual information tossed in here and there along with a generous helping of bullshit. The intent was primarily shock value.
Legend has it that the alt.sex.bestiality newsgroup where most of this stuff originated was created as a joke but people who are actually into this stuff found it and ran with it. Maybe so, maybe not. Who knows?