I think most of the walkways are there for scenery purposes/map borders, rather than actual walkways.
If you check out the walkthrough, towards the bottom pages, there is a detailed breakdown of the sex scenes, with the associated characters and fetishes. I posted a link to the walkthrough a while back in this
comment here. That'll be easier than me listing out all the scenes/fetishes, in the game, that I know by memory. If you have any specific questions after reading the scene summaries let me know. I can provide more detailed information from there.