Variety is a synonym of Race. Race is related to Sport. you are likely to find Ball in/at/on Sport. Ball is a type of Sphere. 
Love is related to Desire. Desire is related to Sexual. 
Variety <--Synonym--> Race <--RelatedTo--> Sport <--AtLocation-- Ball --IsA--> Sphere 
Love <--RelatedTo--> Desire <--RelatedTo--> Sexual 