It's about establishing roles in the relationship.
Yan and Ying are not degrading, people are fulfilled--and somewhat relieved--to be helped into their proper position--no pun intended.
I am dominant with both sexes. And have--and still do have--many close relationships.
I have been told, many times, that never has individual achieved such joy and satisfaction.
They start out--very early---being chained to my cock. Often sleep that way, some times are 'walked' to other rooms, leashed.
I use a 30" stainless o.b. chain for training. Generally it is worn at least until wearer brings it to me, w/o being asked or prompted--and sighs happily when it is put in place.
It is looped around my cock and balls and their throat.
In some cases, hands are secured behind back.
30" OB Chain | QC Supply