Lisewska, according to the Polish website Super Express, was to kick off her "sex marathon" earlier this month in Prague.
Blog posts on a website bearing her name seem to be chronicling the young woman's epic journey, but the story has been called into question because she's reportedly not yet responded to media interviews.
"I'm no superstar," an Aug. 16 post reads. "I am Ania Lisewska — a simple girl who wants to sleep with 100,000 men, nothing more."
The credibility of her goal is also raising eyebrows — 20-minute romps with 100,000 men would take 33,333 consecutive hours, or 3.8 years, without taking a break.