"Sex" defines when two people bump uglies and when you shove your dick up a girl's vagina, whereas "gender" defines what you suck when bored. The distinction is important in law, as it tends to forbid discrimination on the basis of either, e.g. effeminate men cannot be fire cum unless it's in another mans mouth.. In other areas the distinction is primarily important for more people to be involved and to do it in as many holes and in as many positions as possible.
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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 two guys stick their dicks in each others mouthes until they both cum. Buttsecks is annother form where everyone shoves stuff in hole.
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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.