Always be prepared for any interruption during the sensual scenes.
If you are reading your book in a public place, one such scene will arrive just as someone sits down next to you or tries to engage you in conversation about the book you're reading. If you are reading at home while family is around, one such scene will be in progress when your child crawls into your lap or your significant other decides to chat you up. If you are building towards one such scene in your reading and have to set the book aside for a responsibility, you will never be able to get back to the book as quickly as you would like, sometimes even to the extreme of losing the book, leaving it behind at home when you go on a trip, and so on.
This rule is inviolable.