==Removal of material more suited to an essay on morality== 
 I've removed the following because it sounds like an essay on morality and contains lot of weaseling, "in some cultures" etc. Of no use to anyone. 

 :  i.e. an instance of a non-formalised sexual encounter outside of the predominant sexual norm. The degree of discrimination (no-saying) appropriate to human sexual behaviour is socially regulated according to culturally specific norms. 

 : In some cultures, unrestrained sexual activity may be considered inappropriate. Some consider sexual engagement without a view to commitment or relationship-building, in other words "sex for sex' sake" alone, shameful. Others contend that it is in fact the purest form of libidinal expression. Sexual activity beyond the socially prescribed parameter is pejoratively referred to as casual sex. 

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