This is how they show affection!
First, I would ask what you mean by "hold in her urine". It is normal for a rat to urinate while walking sometimes or when you are holding them. My rats won't urinate in the bedding where they sleep, but they urinate all over everywhere else. i know it can be messy, but I just clean out their cages once a week and it's not much of a problem.
It was Adam, he was the first person on Earth!
about 20 rat scratches can kill a person
unfortunately yes it counts as an assault
It typically takes about 30 minutes to 2 hours after drinking water for a person to feel the need to urinate.
No, because in a related question, I answered that is impossible to urinate or have the urge to urinate during sex and if it happened, whatever going on wasn't sexually stimulating to the person.
I don't think you can unless the cat wants to. Cats only urinate where they think it's safe and where it won't get in the way of anything. They usually urinate in sand pits, or boxes, or just places they know they are allowed to 'urinate' in!
If you are talking about the main rat, Remy, then it is Patton Oswalt
Both a pinky rat and a fuzzy mouse can be considered cute, as cuteness is subjective and can vary from person to person.
Coruscant.
A black rat suggests filth, repulsion and/or danger, unless you happen to have a fondness for pet rats or lab experiments. In American slang, "a rat" also is a person who betrays friends or associates. To "smell a rat" means sensing that something criminal is going on.
1-3 depending on how much they have to drink.