Bom Chika Wahwah. Sexy Time, Sexy time! Leets all have sex right now!
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"Sex" defines what is biologically present, whereas "gender" defines what society expects of persons of different sexes. The distinction is important in law, as it tends to forbid discrimination on the basis of either, e.g. effeminate men cannot be fired for not acting according to their "gender". In other areas the distinction is primarily important for more abstracted social and legal arguments, rather than everyday use.
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The term ''sex'' is often used to denote the activity of sexual relations, and as such it is subject to laws of social conduct.