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Don't forget Breite Gasse. 4 more Laufhäuser. But only good for day-fuck. You easily get there by going to Konstablerwache. (9 eur ticket allows you to travel everywhere for 1 month, even to all FKK...

That made me laugh. There's only one girl that description fits to. She's pretty famous and turned your change into crack immediately.

Here's a video when she was better looking old days.
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Frankfurt ist cheapest city for sex in Germany. I wouldn't make an effort to travel to Darmstadt. Travel +entrance fee + girls 100 eur for 30 min. Some girls at Laufhäusern even have worked there...

Why should someone visit FKK when hes spending time at Frankfurt? There are more then 10 brothels called "Laufhäuser" where you can fuck for 30 eur!

Besides. Best FKK is located at Pohlheim.