Your examples of getting tired after sex or satisfied after eating are based on current human physiology and neurochemistry, which I think most people here are assuming will no longer confine our drives after AI/uploading. How can you be sure what you would do if you didn't get tired?

I got bored with playing Gran Turismo all the time in less than a week - the timescale might change, but eventually blessed boredom would rescue me from such a loop.

Edit: From most known loops of this type - I agree with your concern about loops in general.