IF your stuck with the message "where am I" quest or "Go to the wall behind the sarcophagus" and cant proceed to interact with the dildo, you need to CLEAR the text messages first. Here's how I did it:
1. I stood on the reset quest button at stating point, this got rid of the "where am I" text.
2. Next I went to behind the sarcophagus like the message says to do, but the wall had already been opened from a previous play.
3. TIP... now go thru the open wall (where the wall had opened) and go to the 'opposite side' of the walls (basically in the next area) check at both corners. This cleared the 'stuck' text.
NOTE: If you haven't played previously... the wall behind the sarcophagus box SHOULD open... however the TEXT saying to do so may not clear. For that fix go to opposite side of the same wall (next room) as described in the TIP above.
Now you can proceed up the steps to the book, and should be able to interact with it for next quests... Also you'll need to check the book multiple times after each step of the next quests... cloths removal, ritual, etc.
Gotta add that yes. this early game is really buggy IE. During the Ritual... there was now 2 girls... the camera went into a low angle camera view, and afterward I was forever stuck 'inside her body' view point. I couldn't even see the armors I had just received. Gotta say that is one cute girl though!