Travelling long distances for the sole purpose of seeking and exploiting easy sex, usually to destinations like Bangkok, Thailand or Portland, Oregon where the locals are more attractive and easier to fuck than wherever you came from.
"Uli can't find any prostitutes around the fetid vulture nest he lives in, so when he wants to fuck strangers he takes vacations to places that have a thriving sex tourism industry, like Portland."
A Southern sex tourist is an Easterner who goes to the South for the purpose of having sex with the natives there. This is because of the reputed passion and sizzle of Southerners of both races.
Meredith needed time away from her life as a Hamptons socialite. She decided to go to South Carolina as a Southern sex tourist: she wanted to have sexual intercourse with rednecks with wild abandon and return to her well-ordered, superior life back home.