User blog comment:Relikz/Chapter 364: Tartarus Arc, Part 1: Immorality and Sinners, Review./@comment-7505640-20131220125754/@comment-7418318-20131220163954

Interrestingly enough I first learned of that term when playing Vampire: Bloodliens, where it is refering to the first time the played sucks blood from a Human after becoming a vampire, rather than having sexual meaning, though I did come across it a few times since then.