Don't step back until you've closed your pants again. Reduce noise at all costs. Grunting is not acceptable. When you find an unflushed toilet, leave it alone and use another. Some university dormitories have co-ed bathrooms.
New rules apply for dealing with the females.
Never, ever, comment on how they look in the morning. Don't ask what the little wastebasket is for. If urinals are present, only use them when absolutely no females are around. If you are noticed by a female, try your best to ignore her presense until you're dressed again. Use them only if absolutely no other option is available.