Sentence:  In The Gambia, [...] hundreds of young, middle-aged, and elderly female tourists [...] flood the beaches and resorts of Senegambia, Fajara, Kotu, and Kololi each year in search of sexual liaisons with local young men known as <WSD>bumsters</WSD>. 
Meaning of the word marked with <WSD> tags:  In The Gambia, a young man who solicits money or favours from tourists, sometimes in exchange for sex.