Autosodomy

This self-destructive act of autosodomy is the most powerful symbol in the novel for what is the essence of Cela's judgement on the Civil War: the sterile orgasm of a perverted national psyche.

O, Schreber! Your ex-old lady is fucking your boyfriend's girlfriend's sister in a promiscuous chain which proliferates its momentum until it freefalls in autosodomy.

Perhaps it can help you in your autosodomy analisys.