Louise and Martine Fokkens (really?) have sucked everything they can from the prostitute business in Amsterdam. The twins are Amsterdam’s oldest prostitutes, but have officially decided to retire at the age of 70, after being in the business for more than 50 years.

It is estimated that between the two ladies, over 335 000 men have made use of their services.

Even though twins haven’t taken on any new “projects” for a number of years, their retirement is now official. The pair’s reasons for retirement include advancing arthritis and, um, failure to attract new clientele.

But Martine still sees one of her regulars.

I couldn’t give him up. He’s been coming to me for so long like it’s like going to church on a Sunday.

The Fokkens have recently finished a book on their sexual endeavors called, “The Ladies of Amsterdam.” A documentary, “Meet the Fokkens” aired in 2012.

The twins have become celebs, posing for photos and signing autographs.

[Huffington Post, YouTube]