After reading all of this, it is a good experience to read about this. I was at one time wondering about all of this and how it was handled in a Dojo. I have never wondered about me, but wondered what people thought about the matter. I believe at first it takes some opening up, but when you open up, the physicality is not a problem. I think that you have to admit there are going to be accidents, but it is easy to tell that is an accident and what is intentional. I believe that you have to trust your dojo mates physically, If you don;t it would be very hard to work with them. I think though, as you grow in rank, you will become more intimate with your technique with each individual. Aiki is love. That is all i had to say.