My experience at Mainhattan, Shark, Oase, Palace, and World is that most girls are nude or wear barely anything. And even if a girl has a top on, if you show any interest, she would pull it down and let you rub her breast.
Some of my best memories is stepping in at the front desk of World. Sometimes there would be a girl taking a break in the front chatting with the front desk lady. She'd be completely nude in the bright light, so you could see everything. As I pay the fee, she would flirt and offer to give me a tour. She would take my hand and place it on her body as she takes me to the lockers. Of course I'm now obliged to session with her.

But it's worth the experience.
Or I can be eating at the buffet, and a completely gorgeous nude girl sits across from me. I could see her pussy under the table. And I would jump at the chance to ask for a session right there and then.
The last time I was at Shark, some random girl came up to me as I was lounging, and just DFK me. She was older but still attractive. But I just finished as session and wasn't ready for another. I guess business was slow.
Given these experiences near Frankfurt, I don't think it'd get any better at Cologne. I think I'll stick with Frankfurt

. Thank you for the feedback!