I feel like such an illiterate idiot for not realizing that not only is human x undead canon, but there's ways to make it work for the undead to feel pleasure.
wowpedia.fandom.com
Or maybe it's just something gnolls read when they can't get laid?

A Steamy Romance Novel: Forbidden Love
A Steamy Romance Novel: Forbidden Love can be obtained by pickpocketing humanoids in Northrend. Additionally, Martar the Not-So-Smart in Jade Forest drops it as well.
Or maybe it's just something gnolls read when they can't get laid?