Frankfurt East is a typical industrial area with very large spaces and easy access. It's far away from the hassle of the banking and tourist quarters, but still very easy to reach from highways, airport and even by public transport. Nobody will suspect a visit to a brothel if you tell them you are heading to Hanauer Landstrasse. FKK Mainhatten is a pretty comfy clothing-optional sex club that is perfect for chilling out and having fun for a couple of hours.