To be blunt, if I were to wake up with the dick of the person I was sleeping with in my ass or mouth, or if I found it had been there while I was asleep (can't see that taking place) I might feel as though they had taken inappropriate steps with me.
If I woke up and they were sucking me or masturbating me, I would smile and enjoy the ride. If I found that they did it while I slept I would tell them to awaken me the next time so we could both enjoy it.
I mean, really? Are we going to say "he touched me in my naughty place?"
Just because there might be a good majority that do enjoy this activity, one shouldn't just assume that their boyfriend or girlfriend will. Besides the fact that it is not difficult to communicate with ones boyfriend/girlfriend to make sure they don't have a problem with it.
In so many situations in relationships communication is the best thing to do to avoid any issues, yet people either refuse or just don't do it with the person you either love or really like. Which then leads to problems that could have been avoided with simple communication.

