@justforthelulz if it weren't for officer John and the cat gang I'd agree, but I think this might be actual nonfiction self-help books. I mean guides to proper/engaging/effective sex for physically handicapped couples exists irl, so serious guides to foreplay for inter species/spirit relations would absolutely be a thing.
The "48 Ways" is a reference to a cultural parody on the 48 sumo winning moves.
http://www.ageekinjapan.com/the-48-japanese-sexual-positions/
It's a Japanese kamasutra, so to speak.