Defining the validity of oral sex in most cases depends on specific society and its cultural ans social values. In some societies oral sex is regarded completely insane and badly against the social and cultural values of that pertical society, while other societies may regard oral sex as completly a personal business or persoanl choice therefore has no say on the matter because even if a person chooses to do so or not, it does not affect the lives of other idividuals living in the same society in any way. For examle..By law,even the law enforcement agencies (such as police) cant intervene into "swingers' club" in Canada. Swingers' Club is a group of individuals doing group sex or "gang bang" as we know it. In Nepal it would have been a insane thing to do it.