Eros Center Stuttgart: visited today (sunday) at 2:30pm. There are less than 10 girls. Maybe 5-7. Mix of moldavian, romanian, italian and dutch. They look ok'ish, and definitely fuckable.
However they are asking for €50 for a 20 min suck and fuck. With my previous experience at €30, I decided not to get any of the girls and left.
It's also quite difficult to get there via public transport, need to take the s-ban and the bus (which are often lates)