I used ot live near Bielefeld. Really nothing there. My recomendation is to travel to Minden or Buende. In Buende there is an Eros center right off the A1. In Minden there is a nice brothel that attracts customers from as far as Hamburg and Berlin. The prices are a bit high but it is supposed to be nice. It's a little outside the city by the TV tower next to a disco WDF1 or something, the locals will know it.