This is a phenomenon which exists in an underground way, but almost like a well kept secret that many many people know about. It especially involves women from Western countries having romantic relationships with men (the Caribbean and Kenya are the biggest places), breaking racial barriers and gender stereotypes.
Here is an excerpt from another interesting article:
Moussa flipped through a stack of photos. In one image, an overweight, Spanish woman — his first "girlfriend" — has her arms around his small frame. She gave him $500, he said, before heading home. Another photo is a self-taken shot of him with an Italian woman who he said gave him the $650 to open his souvenir shop in Dakar where we now sit, drinking spicy Touba coffee.
He pointed out the gifts tourists send him: CDs, USB drives, a guitar, an MP3 player and a DVD player.
"I don't ask for money," he said. "We go out. They pay for everything. We have sex. Before they leave, they give me a bit cash to help me out."
Read more at: http://cambodiacalling.blogspot.com/2010/04/female-sex-tourism.html