Echthuren.de is one of the leading sex portals in Germany. As it stands they have over 7 million members, yes, that isn't a misprint. Boasting that many members must mean something and surely finding a casual encounter here wouldn't be that hard. They offer free registration so finding out wasn't going to cost anything, only the time that it takes to make an account.
I wouldn't claim to know what people want from a casual encounter site but having free registration would be a high priority for most of you. Having a good amount of women to explore would be another and as mentioned before Echthuren.de has both of them going for it. It looks to have a good community feel to it and with the number of real members it claims to have you would expect that to be the case.
I'm not exactly sure how I feel about the design and color choice, if I was going to be brutally honest I would say I hate it. It looks semi-professional at best and the stretched-out images just look really poor. It looks a little better on mobile, or at least more optimized to say it nicely. Could Echthuren.de benefit from a design upgrade? I would say a resounding hell yes! As it stands I guess it is what it is and you can certainly still make use of this as a NSA-style encounter site.
Obviously, Echthuren.de is a German site so you will need to translate it if you do not speak German (I don't). I wish they offered a dropdown language selection so I could choose from a few different languages just to make things easier but unless I am blind I didn't see this being offered. Just a few things they should look at and again this is just my opinion, it might not bother you in the slightest but I also feel it needs to be mentioned.