Oral Sex!! Is it a Must? Must you get before you return the favor?

Is oral sex a must? If you are receiving, Ladies/Fellas is it a must that you give? Is there a proper technique? Ladies, is there a blue print too giving head or getting face? You always hear that men don't do it well is that true? What do you even call it? We on the east coast say Face but my ladies on the show say Head....does it matter what we call it? Fellas, do you think it's cool for a women too say "Give me some Head" ? Is it wrong too wanta give and not want it in return?