This is the (S)exual (Ex)ploitation Function (F(SEx) for short), where (ru/16) denotes the 'Constant of Consent'. The formula is read aloud as "Before I fork you, are you over 16, cutie pie?" and is carefully adhered to by anyone from pedophiles and child abusers, to hyper-sexual adolescents.
Girl: "Sir, I don't understand this math problem, what formula do I use to solve it?"
Teacher: "B4·I4Q·(ru/16)·Qtπ ....?"
Girl: "Umm...I don't get it?"
Teacher: "Come and see me after class, then I'll show you how to...do it."