In Poland and possibly other Central European countries, the English word "sponsor" is used to describe a usually older, wealthy man who gives a young female friend money to help her through college, etc. He usually gets sex in return. She usually searches for him through an agency or web site. Both the man and the woman may have other steady partners. Neither the man nor the woman will admit the practice is prostitution, as the couple have a steady friendship and may go on clandestine holidays together, etc. The practice is far less normal in post-feminist Western Europe or North America, where it would be considered prostitution.
Magda from Warsaw posted an advert on the internet looking for a sponsor. She had the looks and the charm, and needed the money to finish her law degree. Her ideal man was about the same age as her father, from somewhere like England or America and good looking. That would make sleeping with him a little easier.