Wait... So... What... Hold up... So the liquid that they ingest makes contact with someone else's mucus membranes cause this mark to appear on their neck?
...So... What happens if a girl sets down a cup or something and another girl mistakenly drinks from it? "OH FUCK, YOU'RE A DIRTY WHORE, YOU GET EXPELLED NOW!"? And, worse yet, the fucking drink erases memories of the act that caused it (some-fucking-how)?
Seriously? What is this retarded bullshit?