So full disclosure I did not have the anus removal or butt closure so my answers are a little different but hopefully still helpful...
With regard to sex, I waited four weeks after my rectum removal. It was definitely a bit of a challenge and isn't totally back to normal yet but I believe it will improve and if not be exactly the same it will reach an acceptable 'new normal'. Go slow, use lubrication, etc etc. I'm guessing the anal closure complicates matters a bit here so I'll defer to others with more personal experience.
You will almost definitely be able to microwave stuff yourself. I had trouble standing for long enough to actually cook anything (cook meaning do more preparation than just reheating). I ate a lot of sandwiches in the beginning (soft deli meats on soft white bread), yogurts, apple sauce, cottage cheese, etc. Probably by two weeks out I was able to boil water and cook/drain pasta myself.
I think I'm an anomaly because I never took naps. I did sleep 8+ hours every night though, which was a DREAM compared to pred insomnia and running to the bathroom every hour. Like everyone else I spent a lot of my waking hours lying on the couch watching TV or reading trashy novels (I recommend Valley of the Dolls if you haven't read it before
). I think it's fine to do simple chores around the house that don't require lifting but I would be wary of something like loading the dishwasher at first just because it would probably require bending down to fill the lower shelves.
Listen to your body, it will probably tell you what is and isn't OK. I remember a couple of weeks post-op I went for a walk on a different route and it ended up being about
twice as long as my usual walks. By the time I got home the aching in my incision and The Area Formerly Known As My Rectum was acting up as though it were a week earlier in the healing process. I took some extra Tylenol and resolved to work up to longer walks more slowly. So no real harm done, just had to listen to my body. Another activity that I really like doing post-op is helping with grocery shopping. You can't really do it alone (unless you're only buying, like, one thing) but you can walk around the market, grab most things from the shelves/coolers, even push the cart yourself if you feel able. It feels nice to be productive and now that we're getting into summer it is nice and cool inside