I am confused, Soaplands are generally guaranteed sex. Delivery Health service is where you shouldn't expect sex (but could well get it).
Tobita, and those other red light district areas obviously stone cold solid guaranteed sex of course.
On another note I highly recommend going to a Japanese strip club (Japanese style) - its quite the cultural experience!
(if you want a more Western style one the Apollo building has 5 floors, expensive however). The one I went to is Toyo Show Theatre.
You have to sit in silence and clap when they pose, you need to see it!