Oh, Amersterdam...

Believed to be the Red Light District's oldest prostitutes, Louise and Martine Fokken have spent more than 50 years on the job and approximately 355,000 men between them. The 70-year-old twins recently decided to retire.

The two recently finished a book on their sexual endeavors titled "Ladies of Amsterdam" and were the subjects of a 2012 documentary, "Meet The Fokkens."

To see photos and a video of this this dynamic (and arthritic) duo, CLICK HERE