Wikipedia
A sanky-panky, is a male sex worker, found in the Caribbean in the Dominican Republic. A sanky-panky solicits on beaches and has clients of both sexes or only women. When with men, the sanky-panky assumes an active (a.k.a. top) role, but when with women, assumes the role of an ideal lover.
While strictly speaking they are not prostitutes, since they do not directly negotiate money for sex, they are more likely to create a pseudo-relationship which can be continued when the guest returns home. They then attempt to ask for money to be sent to them primarily by wire transfer, often using elaborate stories of need, involving (for example) sick relatives. A sanky's ultimate goal is to obtain a marriage visa to the tourist's native country, marry the tourist, then leave for areas of the country with large populations of their country persons.