Sexual is a synonym of Intimate. Intimate is similar to Personal. 
Appropriate is a synonym of Allow. Allow is related to Like. Like is related to Continent. you are likely to find River in/at/on Continent. 
Sexual <--Synonym--> Intimate <--SimilarTo--> Personal 
Appropriate <--Synonym--> Allow <--RelatedTo--> Like <--RelatedTo--> Continent <--AtLocation-- River 