Sodomizing consists of anally penetrating an individual with a dildo that is inserted into a harness.
A mistress has to know how to convert this practice into an entire art. It is not merely a simple penetration. There must be feeling and dildo play as if it were a real cock in order to transmit sensations of pain, pleasure, humiliation and domination.
I have dildos of different sizes that I use to dilate the anus-- the largest of which I can insert in my harness is a huge 28 cm long by 7 cm thick.