Significant is related to Importance. Importance is derived from Important. Important is the opposite of Light. Highlight is a type of Light. 
Sex is related to Aggression. Violence is a type of Aggression. 
Significant <--RelatedTo--> Importance --DerivedFrom--> Important <--Antonym--> Light <--IsA-- Highlight 
Sex <--RelatedTo--> Aggression <--IsA-- Violence 