This is what I thought about (travellingjezebel.com/sex-tourism-the-gambia/):
However, this notion of ‘romance tourism’ creates an uncomfortable grey area, where female sex tourists leave themselves open to being hurt by men who are really just trying to make a living for themselves.
Because female sex tourists often do not view themselves as such, and thus may not want to embark on an explicitly transactional relationship, the male sex worker has to be a little sneakier about how he goes about his work. He will usually observe holidaymakers and profile them in the hopes of selecting a worthy target.
Typically, he will look for older women who may be overweight or considered unattractive back home. He considers such women vulnerable, or ‘easy prey,’ and he will play on this woman’s vulnerability in order to get her to obtain feelings for him. When feelings are involved, the male sex worker finds it easier to convince the woman to spend her money on him, and so the exchange begins.
So the older women - often it seems in their 40s/50s - are really in search of love. I don't feel the men are being exploited in this kind of dynamic. The men do hunt the women. I know this is all generalisation, but then so is the granny gyrating against a teenager at the bar, supporting herself on a Zimmer frame - as described in I think The Sun.
I think it's a bad business, trying to make someone vulnerable fall for you, telling them you love them and find them attractive, and fleecing them for cash. The more transactional male approach with female prostitutes is very bald but at least both sides understand the deal. (I won't get into that though as obviously there is rank exploitation here and coercion of the female - and male - prostitutes by their bosses, etc.).
I don't know if the love guys of Gambia have pimps. One article said they compete with each other for the best/richest women, and are proud of being self-employed and supporting their families.
Maybe everyone is being exploited. But I guess it's bringing money in that supports people.